Make uv use constraints like pip

tox.ini

@@ -70,7 +70,11 @@ setenv =
   COVERAGE_FILE = {env:COVERAGE_FILE:{envdir}/.coverage.{envname}}
   COVERAGE_PROCESS_START={toxinidir}/pyproject.toml
   PIP_CONSTRAINT = {toxinidir}/.config/constraints.txt
-  devel,pkg,pre,py310: PIP_CONSTRAINT = /dev/null
+  UV_CONSTRAINT = {toxinidir}/.config/constraints.txt
+  devel,pkg,pre,py310,lint,hook,deps,schemas: PIP_CONSTRAINT = /dev/null
+  devel,pkg,pre,py310,lint,hook,deps,schemas: UV_CONSTRAINT = /dev/null
+  lower: PIP_CONSTRAINT = {toxinidir}/.github/lower-constraints.txt
+  lower: UV_CONSTRAINT = {toxinidir}/.github/lower-constraints.txt
   PIP_DISABLE_PIP_VERSION_CHECK = 1
   PRE_COMMIT_COLOR = always
   # Number of expected test passes, safety measure for accidental skip of
@@ -108,23 +112,15 @@ commands =
 passenv =
   {[testenv]passenv}
   PRE_COMMIT_HOME
-setenv =
-  {[testenv]setenv}
-  # avoid messing pre-commit with out own constraints
-  PIP_CONSTRAINT=
 
 [testenv:lower]
 description = Install using lower-constraints.txt file for testing oldest versions.
-setenv =
-  PIP_CONSTRAINT = {toxinidir}/.github/lower-constraints.txt
 
 [testenv:hook]
 description = Validate pre-commit hook definition
 deps = pre-commit
 commands =
   ./tools/test-hook.sh
-setenv =
-  PIP_CONSTRAINT=/dev/null
 
 [testenv:deps]
 description = Bump all test dependencies
@@ -134,9 +130,6 @@ skip_install = true
 basepython = python3.10
 deps =
   {[testenv:lint]deps}
-setenv =
-  # without his upgrade would likely not do anything
-  PIP_CONSTRAINT = /dev/null
 commands_pre =
 commands =
   -pre-commit run --all-files --show-diff-on-failure --hook-stage manual lock
@@ -178,9 +171,6 @@ commands =
 description = Rebuild and test JSON Schemas
 deps =
   check-jsonschema>=0.26.3
-setenv =
-  # without this upgrade would likely not do anything
-  PIP_CONSTRAINT = /dev/null
 skip_install = true
 changedir = test/schemas
 commands_pre =