chore(deps): bump mypy from 1.19.1 to 1.20.0

Bumps [mypy](https://github.com/python/mypy) from 1.19.1 to 1.20.0.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.19.1...v1.20.0)

---
updated-dependencies:
- dependency-name: mypy
  dependency-version: 1.20.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

test-requirements.txt

@@ -2,7 +2,7 @@ pycodestyle==2.14.0
 pydocstyle==6.3.0
 dodgy==0.2.1
 isort==8.0.1
-mypy==1.19.1
+mypy==1.20.0
 Flask-Testing==0.8.1
 nose2-cov==1.0a4
 coverage==7.13.5