Bump tox-gh-actions from 2.8.1 to 2.9.1 in /requirements

Bumps [tox-gh-actions](https://github.com/ymyzk/tox-gh-actions) from 2.8.1 to 2.9.1.
- [Release notes](https://github.com/ymyzk/tox-gh-actions/releases)
- [Commits](ymyzk/tox-gh-actions@v2.8.1...v2.9.1)

---
updated-dependencies:
- dependency-name: tox-gh-actions
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements/tox.txt

@@ -1,3 +1,3 @@
 -r ./coverage.txt
 tox==3.24.5
-tox-gh-actions==2.8.1
+tox-gh-actions==2.9.1