Update mypy requirement from ==1.11.2 to ==1.12.0

Updates the requirements on [mypy](https://github.com/python/mypy) to permit the latest version.
- [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
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

pyproject.toml

@@ -36,7 +36,7 @@ chevron = "=0.14.0"
 pytest = ">=2.8"
 pytest-cov = ">=2.4.0"
 pytest-mypy = "==0.10.3"
-mypy = "==1.11.2"
+mypy = "==1.12.0"
 
 
 [tool.poetry.group.docs]