Update actions/github-script action to v7

Author: renovate[bot]

.github/workflows/pr-terraform.yaml

@@ -86,7 +86,7 @@ jobs:
           TF_WORKSPACE: prod
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
-      - uses: actions/github-script@v6
+      - uses: actions/github-script@v7
         if: github.event_name == 'pull_request'
         env:
           PLAN_STAGING: "terraform\n${{ steps.plan-staging.outputs.stdout }}"