build(deps): update mypy requirement from ~=1.5 to ~=2.1

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@v1.5.0...v2.1.0)

---
updated-dependencies:
- dependency-name: mypy
  dependency-version: 2.1.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements_ci.txt

@@ -2,7 +2,7 @@
 codecov ~= 2.1
 coverage ~= 7.2
 flake518 ~= 1.6
-mypy ~= 1.5
+mypy ~= 2.1
 pydocstyle ~= 6.3
 pylint ~= 4.0
 twine ~= 6.1