Bump mypy from 1.19.1 to 1.20.2

Bumps [mypy](https://github.com/python/mypy) from 1.19.1 to 1.20.2.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.19.1...v1.20.2)

---
updated-dependencies:
- dependency-name: mypy
  dependency-version: 1.20.2
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

poetry.lock

@@ -59,7 +59,7 @@ pytest = "^9.0.3"
 pytest-flake8 = "=1.3.0"
 pytest-cov = "^7.0.0"
 tox = "*"
-mypy = "^1.19"
+mypy = "^1.20"
 isort = "^8.0.0"
 black = "^26.3.1"
 flynt = "^1.0"