Bump debugpy from 1.8.8 to 1.8.9 in /requirements

Bumps [debugpy](https://github.com/microsoft/debugpy) from 1.8.8 to 1.8.9.
- [Release notes](https://github.com/microsoft/debugpy/releases)
- [Commits](microsoft/debugpy@v1.8.8...v1.8.9)

---
updated-dependencies:
- dependency-name: debugpy
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

requirements/requirements-testing.txt

@@ -12,5 +12,5 @@ flake8==7.1.1
 mypy==1.13.0
 
 # other dev stuff
-debugpy==1.8.8
+debugpy==1.8.9
 pip-check==2.9