chore: bump actions/cache from 3 to 4 (#17)

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -28,7 +28,7 @@ jobs:
 
             - name: Cache Composer packages
               id: composer-cache
-              uses: actions/cache@v3
+              uses: actions/cache@v4
               with:
                   path: ${{ steps.composer-cache-dir.outputs.dir }}
                   key: ${{ runner.os }}-${{ matrix.php-versions }}-composer-${{ hashFiles('**/composer.json') }}
@@ -70,7 +70,7 @@ jobs:
 
             - name: Cache Composer packages
               id: composer-cache
-              uses: actions/cache@v3
+              uses: actions/cache@v4
               with:
                   path: ${{ steps.composer-cache-dir.outputs.dir }}
                   key: ${{ runner.os }}-${{ matrix.php-versions }}-composer-${{ hashFiles('**/composer.json') }}