Bump mypy from 1.11.2 to 1.12.0 in /tools (#87)

Bumps [mypy](https://github.com/python/mypy) from 1.11.2 to 1.12.0.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.11.2...v1.12.0)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

tools/poetry.lock

@@ -16,7 +16,7 @@ pypdfium2 = "^4.30.0"
 pillow = "^10.4.0"
 
 [tool.poetry.group.dev.dependencies]
-mypy = "^1.11"
+mypy = "^1.12"
 types-pillow = "^10.2"