Update mypy requirement in /tools in the python-packages group

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

Updates `mypy` to 1.15.0
- [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
  dependency-group: python-packages
...

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

tools/requirements.txt

@@ -1,7 +1,7 @@
 Jinja2~=3.1.5
 MarkupSafe==3.0.2
 requests~=2.32.3
-mypy~=1.14
+mypy~=1.15
 black~=25.1.0
 isort~=6.0.0
 flake8~=7.1.1