build(deps): bump actions/github-script from 7.0.1 to 9.0.0

Bumps [actions/github-script](https://github.com/actions/github-script) from 7.0.1 to 9.0.0.
- [Release notes](https://github.com/actions/github-script/releases)
- [Commits](actions/github-script@60a0d83...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>

Author: dependabot[bot]

.github/workflows/gardener-investigate-issue.yml

@@ -104,7 +104,7 @@ jobs:
       - name: Prepare Slack payload
         id: slack_payload
         if: always()
-        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
         env:
           STRUCTURED_OUTPUT: ${{ steps.investigate.outputs.structured_output }}
           START_RESPONSE: ${{ steps.start_slack.outputs.response }}