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:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Pipfile

@@ -12,7 +12,7 @@ pydantic = "==2.12.5"
 black = "==26.3.1"
 pytest = "==9.0.2"
 pytest-mock = "==3.15.1"
-mypy = "==1.19.1"
+mypy = "==1.20.0"
 pytest-mypy-plugins = "==4.0.0"
 pytest-cov = "==7.1.0"