chore(deps): update mypy requirement from ==2.2.* to ==2.3.*

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@v2.2.0...v2.3.0)

---
updated-dependencies:
- dependency-name: mypy
  dependency-version: 2.3.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements-testing.txt

@@ -7,6 +7,6 @@ pytest-xdist == 3.8.*
 types-PyYAML == 6.*
 black == 26.*; python_version >= "3.10"
 black == 25.*; python_version < "3.10"
-mypy == 2.2.*; python_version >= "3.10"
+mypy == 2.3.*; python_version >= "3.10"
 mypy == 1.19.*; python_version < "3.10"
 ruff == 0.15.*