build(deps-dev): 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

@@ -16,6 +16,6 @@ psycopg-binary = {version = "==3.3.3", markers="implementation_name == 'cpython'
 pytest-cov = "==7.1.0"
 pytest-xdist = "==3.8.0"
 mock = "==5.2.0"
-mypy = {version = "==1.19.1", markers="implementation_name == 'cpython'"}
+mypy = {version = "==1.20.0", markers="implementation_name == 'cpython'"}
 types-setuptools = "==82.0.0.20260210"
 tbump = "==6.11.0"