Bump actions/cache to v4

Author: cracksalad

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Cache Composer dependencies
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: /tmp/composer-cache
           key: ${{ runner.os }}-${{ hashFiles('**/composer.lock') }}
@@ -57,7 +57,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Cache Composer dependencies
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: /tmp/composer-cache
           key: ${{ runner.os }}-${{ hashFiles('**/composer.lock') }}