ci: bump actions/github-script to v9 (#214)

Bumps [actions/github-script](https://github.com/actions/github-script) from 8.0.0 to 9.0.0.
- [Release notes](https://github.com/actions/github-script/releases)
- [Commits](actions/github-script@ed59741...3a2844b)

---
updated-dependencies:
- dependency-name: actions/github-script
  dependency-version: 9.0.0
  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>

Author: dependabot[bot]

.github/workflows/links.yml

@@ -31,7 +31,7 @@ jobs:
       - name: Find existing broken-links issue
         id: find-issue
         if: steps.lychee.outputs.exit_code != 0
-        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
         with:
           script: |
             const title = 'Broken links found by lychee';