build: bump actions/github-script from 8 to 9

Bumps [actions/github-script](https://github.com/actions/github-script) from 8 to 9.
- [Release notes](https://github.com/actions/github-script/releases)
- [Commits](https://github.com/actions/github-script/compare/v8...v9)

---
updated-dependencies:
- dependency-name: actions/github-script
  dependency-version: '9'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/build_publish_docker_image.yml

@@ -96,7 +96,7 @@ jobs:
         # There's no way around this, because "ImageOS" is only available to
         # processes, but the setup-go action uses it in its key.
         id: imageos
-        uses: actions/github-script@v8
+        uses: actions/github-script@v9
         with:
           result-encoding: string
           script: |