Update mypy requirement from ~=1.14 to ~=1.15 (#1087)

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@v1.14.0...v1.15.0)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

test_bot/test-requirements.txt

@@ -1,6 +1,6 @@
 pytest~=8.3
 pytest-timeout~=2.3
 ruff~=0.9
-mypy~=1.14
+mypy~=1.15
 types-requests~=2.32
 types-PyYAML~=6.0