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

Author: renovate[bot]

.github/workflows/iai-callgrind.yml

@@ -183,7 +183,7 @@ jobs:
 
       - name: Post comment to PR
         if: github.event_name == 'pull_request'
-        uses: actions/github-script@v7
+        uses: actions/github-script@v8
         with:
           script: |
             const fs = require('fs');