Move cache to v4

Author: jellejurre

.github/workflows/ci.yaml

@@ -15,7 +15,7 @@ jobs:
           node-version: 16
       - uses: actions/checkout@v2
       - name: 'Cache node_modules'
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: node_modules
           key: ${{ runner.os }}-node-v16-${{ hashFiles('**/generate.sh') }}