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

Author: renovate[bot]

.github/workflows/GnuComment.yml

@@ -20,7 +20,7 @@ jobs:
       github.event.workflow_run.event == 'pull_request'
     steps:
       - name: 'Download artifact'
-        uses: actions/github-script@v7
+        uses: actions/github-script@v8
         with:
           script: |
             // List all artifacts from GnuTests
@@ -45,7 +45,7 @@ jobs:
       - run: unzip comment.zip
 
       - name: 'Comment on PR'
-        uses: actions/github-script@v7
+        uses: actions/github-script@v8
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           script: |