Bump mypy-dev from 1.11.0a9 to 1.12.0a4

Bumps [mypy-dev](https://github.com/cdce8p/mypy-dev) from 1.11.0a9 to 1.12.0a4.
- [Release notes](https://github.com/cdce8p/mypy-dev/releases)
- [Commits](cdce8p/mypy-dev@1.11.0a9...1.12.0a4)

---
updated-dependencies:
- dependency-name: mypy-dev
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements-dev-3.11.txt

@@ -1,5 +1,5 @@
 homeassistant==2024.3.3
-mypy-dev==1.11.0a9
+mypy-dev==1.12.0a4
 pydantic==2.7.4
 pre-commit==3.7.1
 ruff==0.4.10

requirements-dev-3.12.txt

@@ -1,5 +1,5 @@
 homeassistant==2024.5.1
-mypy-dev==1.11.0a9
+mypy-dev==1.12.0a4
 pydantic==2.7.4
 pre-commit==3.7.1
 ruff==0.4.10