chore(deps): update actions/github-script action to v8

Author: renovate[bot]

.github/workflows/a11y.yml

@@ -13,7 +13,7 @@ jobs:
     steps:
       - name: Extract and Pair AEM Preview URLs
         id: extract_urls
-        uses: actions/github-script@v7
+        uses: actions/github-script@v8
         with:
           script: |
             const prBody = context.payload.pull_request.body || '';
@@ -127,7 +127,7 @@ jobs:
 
       - name: Post accessibility summary comment
         if: always() && steps.generate_report.outcome == 'success'
-        uses: actions/github-script@v7
+        uses: actions/github-script@v8
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           script: |