Update actions/github-script action to v9

Author: renovate[bot]

.github/workflows/pr-checklist.yml

@@ -36,7 +36,7 @@ jobs:
       uses: actions/checkout@v6
     - name: Get pull request details
       id: pr
-      uses: actions/github-script@v8
+      uses: actions/github-script@v9
       with:
         script: |
           const pr_desc = await github.rest.pulls.get({