fix erroneous actions/cache version

Author: keithamus

.github/workflows/pages.yml

@@ -44,7 +44,7 @@ jobs:
         id: pages
         uses: actions/configure-pages@v5
       - name: Restore npm cache
-        uses: actions/cache@v5
+        uses: actions/cache@v4
         with:
           path: ~/.npm
           key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}