ruff automatic fixes: from __future__ import annotations

```
ruff.....................................................................Failed
- hook id: ruff
- files were modified by this hook

Fixed 44 errors:
- tests/test_class_sh_basic.py:
    1 × I001 (unsorted-imports)
    1 × I002 (missing-required-import)
- tests/test_class_sh_disowning.py:
    1 × I001 (unsorted-imports)
    1 × I002 (missing-required-import)
- tests/test_class_sh_disowning_mi.py:
    1 × I001 (unsorted-imports)
    1 × I002 (missing-required-import)
- tests/test_class_sh_factory_constructors.py:
    1 × I001 (unsorted-imports)
    1 × I002 (missing-required-import)
- tests/test_class_sh_inheritance.py:
    1 × I001 (unsorted-imports)
    1 × I002 (missing-required-import)
- tests/test_class_sh_mi_thunks.py:
    1 × I001 (unsorted-imports)
    1 × I002 (missing-required-import)
- tests/test_class_sh_module_local.py:
    1 × I001 (unsorted-imports)
    1 × I002 (missing-required-import)
- tests/test_class_sh_property.py:
    1 × I002 (missing-required-import)
- tests/test_class_sh_property_non_owning.py:
    1 × I001 (unsorted-imports)
    1 × I002 (missing-required-import)
- tests/test_class_sh_shared_ptr_copy_move.py:
    1 × I001 (unsorted-imports)
    1 × I002 (missing-required-import)
- tests/test_class_sh_trampoline_basic.py:
    1 × I001 (unsorted-imports)
    1 × I002 (missing-required-import)
- tests/test_class_sh_trampoline_self_life_support.py:
    1 × I001 (unsorted-imports)
    1 × I002 (missing-required-import)
- tests/test_class_sh_trampoline_shared_from_this.py:
    1 × I001 (unsorted-imports)
    1 × I002 (missing-required-import)
- tests/test_class_sh_trampoline_shared_ptr_cpp_arg.py:
    1 × I001 (unsorted-imports)
    1 × I002 (missing-required-import)
- tests/test_class_sh_trampoline_unique_ptr.py:
    1 × I001 (unsorted-imports)
    1 × I002 (missing-required-import)
- tests/test_class_sh_unique_ptr_custom_deleter.py:
    1 × I001 (unsorted-imports)
    1 × I002 (missing-required-import)
- tests/test_class_sh_unique_ptr_member.py:
    1 × I001 (unsorted-imports)
    1 × I002 (missing-required-import)
- tests/test_class_sh_virtual_py_cpp_mix.py:
    1 × I001 (unsorted-imports)
    1 × I002 (missing-required-import)
- tests/test_classh_mock.py:
    1 × I001 (unsorted-imports)
    1 × I002 (missing-required-import)
- tests/test_descr_src_loc.py:
    1 × I001 (unsorted-imports)
    1 × I002 (missing-required-import)
- tests/test_exc_namespace_visibility.py:
    1 × I002 (missing-required-import)
- tests/test_type_caster_odr_guard_1.py:
    1 × I001 (unsorted-imports)
    1 × I002 (missing-required-import)
- tests/test_type_caster_odr_guard_2.py:
    1 × I001 (unsorted-imports)
    1 × I002 (missing-required-import)

Found 44 errors (44 fixed, 0 remaining).
```

Author: rwgk

tests/test_class_sh_basic.py

@@ -1,4 +1,6 @@
 # Importing re before pytest after observing a PyPy CI flake when importing pytest first.
+from __future__ import annotations
+
 import re
 
 import pytest

tests/test_class_sh_disowning.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import pytest
 
 from pybind11_tests import class_sh_disowning as m

tests/test_class_sh_disowning_mi.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import pytest
 
 import env  # noqa: F401

tests/test_class_sh_factory_constructors.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import pytest
 
 from pybind11_tests import class_sh_factory_constructors as m

tests/test_class_sh_inheritance.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 from pybind11_tests import class_sh_inheritance as m
 
 

tests/test_class_sh_mi_thunks.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import pytest
 
 from pybind11_tests import class_sh_mi_thunks as m

tests/test_class_sh_module_local.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import class_sh_module_local_0 as m0
 import class_sh_module_local_1 as m1
 import class_sh_module_local_2 as m2

tests/test_class_sh_property.py

@@ -1,5 +1,6 @@
 # The compact 4-character naming scheme (e.g. mptr, cptr, shcp) is explained at the top of
 # test_class_sh_property.cpp.
+from __future__ import annotations
 
 import pytest
 

tests/test_class_sh_property_non_owning.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import pytest
 
 from pybind11_tests import class_sh_property_non_owning as m

tests/test_class_sh_shared_ptr_copy_move.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 from pybind11_tests import class_sh_shared_ptr_copy_move as m
 
 

tests/test_class_sh_trampoline_basic.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import pytest
 
 from pybind11_tests import class_sh_trampoline_basic as m

tests/test_class_sh_trampoline_self_life_support.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import pytest
 
 import pybind11_tests.class_sh_trampoline_self_life_support as m

tests/test_class_sh_trampoline_shared_from_this.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import sys
 import weakref
 

tests/test_class_sh_trampoline_shared_ptr_cpp_arg.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import pytest
 
 import pybind11_tests.class_sh_trampoline_shared_ptr_cpp_arg as m

tests/test_class_sh_trampoline_unique_ptr.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import pybind11_tests.class_sh_trampoline_unique_ptr as m
 
 

tests/test_class_sh_unique_ptr_custom_deleter.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 from pybind11_tests import class_sh_unique_ptr_custom_deleter as m
 
 

tests/test_class_sh_unique_ptr_member.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import pytest
 
 from pybind11_tests import class_sh_unique_ptr_member as m

tests/test_class_sh_virtual_py_cpp_mix.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import pytest
 
 from pybind11_tests import class_sh_virtual_py_cpp_mix as m

tests/test_classh_mock.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 from pybind11_tests import classh_mock as m
 
 

tests/test_descr_src_loc.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import pytest
 
 from pybind11_tests import descr_src_loc as m

tests/test_exc_namespace_visibility.py

@@ -10,6 +10,7 @@
 # test_cross_module_exception_translator (test_exceptions.py) failure. This
 # test has to be imported (by pytest) before test_exceptions.py; pytest sorts
 # lexically. See https://github.com/pybind/pybind11/pull/4054 for more information.
+from __future__ import annotations
 
 import itertools
 

tests/test_type_caster_odr_guard_1.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import pytest
 
 import pybind11_tests

tests/test_type_caster_odr_guard_2.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import pytest
 
 import pybind11_tests.type_caster_odr_guard_2 as m