Install from lockfile

Author: semohr

.github/workflows/javascript.yml

@@ -20,7 +20,7 @@ jobs:
             actions: read # only required for a private repository by github/codeql-action/upload-sarif to get the Action run status
         strategy:
             matrix:
-                node-version: [20]
+                node-version: [21]
         steps:
             - name: Checkout code
               uses: actions/checkout@v4
@@ -33,6 +33,7 @@ jobs:
               with:
                   node-version: ${{ matrix.node-version }}
                   cache: "pnpm"
+                  cache-dependency-path: frontend/pnpm-lock.yaml
             - name: Install dependencies
               run: |
                   cd ./frontend