Bump actions/github-script from 5 to 6 (#143)

Bumps [actions/github-script](https://github.com/actions/github-script) from 5 to 6.
- [Release notes](https://github.com/actions/github-script/releases)
- [Commits](actions/github-script@v5...v6)

---
updated-dependencies:
- dependency-name: actions/github-script
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Lukas Pilz <lukas.pilz@iup.uni-heidelberg.de>

.github/workflows/upstream-dev-ci.yaml

@@ -54,7 +54,7 @@ jobs:
           always()
           && (steps.conda.outcome != 'success' || steps.install.outcome != 'success' || steps.install.outcome != 'success')
           && github.event_name == 'schedule'
-        uses: actions/github-script@v5
+        uses: actions/github-script@v6
         with:
           script: |
             const title = '⚠️ Upstream CI Failed ⚠️'