Update actions/github-script action to v9

Author: renovate[bot]

.github/workflows/versioning-merge.yml

@@ -48,7 +48,7 @@ jobs:
       run: sudo chmod +x /usr/local/bin/helm
 
     - name: Calculate and stage chart version bumps on main
-      uses: actions/github-script@v8
+      uses: actions/github-script@v9
       with:
         script: |
           // Skip if PR has manual-versioning label

.github/workflows/versioning.yml

@@ -47,7 +47,7 @@ jobs:
             fi
 
         - name: Bump chart versions (no-commit preview on PRs)
-          uses: actions/github-script@v8
+          uses: actions/github-script@v9
           with:
             script: |
                 const { default: runPRVersioning } = await import('${{ github.workspace }}/tooling/runner.js')