Use actions/setup-node@v4 for better npm cache management

Author: adamwoodnz

.github/workflows/phpunit.yml

@@ -47,23 +47,11 @@ jobs:
     steps:
     - uses: actions/checkout@v2
 
-    - name: Cache node modules
-      uses: actions/cache@26968a09c0ea4f3e233fdddbafd1166051a095f6 # v2.1.4
-      env:
-        cache-name: cache-node-modules
+    - name: Install NodeJS
+      uses: actions/setup-node@v4
       with:
-        # npm cache files are stored in `~/.npm` on Linux/macOS
-        path: ~/.npm
-        key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/package-lock.json') }}
-        restore-keys: |
-          ${{ runner.os }}-build-${{ env.cache-name }}-
-          ${{ runner.os }}-build-
-          ${{ runner.os }}-
-
-    - name: Use Node.js 20.x
-      uses: actions/setup-node@v1
-      with:
-        node-version: 20.x
+        node-version-file: '.nvmrc'
+        cache: 'npm'
 
     - name: Npm install and build
       run: |