ci(test): properly escape parenthesis in grep statement (#74)

.github/workflows/update-pages.yml

@@ -93,7 +93,7 @@ jobs:
           cat ./gh-pages/index.html
           echo "---"
           echo "Checking for tracebacks..."
-          grep -i -E 'Traceback (most recent call last):' ./gh-pages/index.html && exit 1 || true
+          grep -i -E 'Traceback \(most recent call last\):' ./gh-pages/index.html && exit 1 || true
 
       - name: Archive gh-pages
         if: ${{ github.event_name == 'pull_request' || github.event_name == 'workflow_dispatch' }}