chore(CI): cache the composer generator deps

.github/workflows/build.yml

@@ -20,6 +20,13 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - name: Cache generator dependencies
+        uses: actions/cache@v4
+        with:
+          path: generator/vendor
+          key: ${{ runner.os }}-generator-vendor-${{ hashFiles('**/composer.lock') }}
+          restore-keys: ${{ runner.os }}-generator-vendor-
+
       - name: Generate our client
         run: make build
 
@@ -34,12 +41,11 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Cache node modules
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: node_modules
           key: ${{ runner.os }}-node_modules-${{ hashFiles('**/package-lock.json') }}
-          restore-keys: |
-            ${{ runner.os }}-node_modules-
+          restore-keys: ${{ runner.os }}-node_modules-
 
       - name: Install openapi-changes
         run: npm install