chore(deps): update actions/github-script action to v9 (ember-cli#2711)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/bench-compare.yml

@@ -49,7 +49,7 @@ jobs:
 
       - name: Post PR comment
         if: always() && steps.checkout.outcome == 'success'
-        uses: actions/github-script@v7
+        uses: actions/github-script@v9
         with:
           script: |
             const fs = require('fs');