chore: update actions/github-script to v9 (Node.js 24)

Fixes Node.js 20 deprecation warning. Node.js 20 actions will be
forced to Node.js 24 starting June 2nd, 2026.

Co-Authored-By: Claude <claude@anthropic.com>

Author: 0x46616c6b

action.yml

@@ -190,7 +190,7 @@ runs:
     - name: Create GitHub Deployments
       id: create_deployments
       if: inputs.create-deployment == 'true' && inputs.github-token != '' && inputs.gitops-token != ''
-      uses: actions/github-script@f28e40c7f34bde8b3046d885e986cb6290c5673b # v7.1.0
+      uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
       env:
         INPUT_GITOPS_DEV: ${{ inputs.gitops-dev }}
         INPUT_GITOPS_STAGE: ${{ inputs.gitops-stage }}