Upgrade checkout and cache to latest versions.

Author: bytes-commerce

.github/workflows/ci.yml

@@ -33,7 +33,7 @@ jobs:
           tools: composer:v2, cs2pr
 
       - name: "Cache dependencies"
-        uses: "actions/cache@v2"
+        uses: "actions/cache@v4"
         with:
           path: |
             ~/.composer/cache