⬆ Bump mypy from 1.4.1 to 1.15.0

Bumps [mypy](https://github.com/python/mypy) from 1.4.1 to 1.15.0.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.4.1...v1.15.0)

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

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

Author: dependabot[bot]

requirements-tests.txt

@@ -2,7 +2,7 @@
 -r requirements-docs-tests.txt
 pytest >=7.0.1,<9.0.0
 coverage[toml] >=6.2,<8.0
-mypy ==1.4.1
+mypy ==1.15.0
 ruff ==0.9.6
 # For FastAPI tests
 fastapi >=0.103.2