Update actions/cache version

Author: ZhukV

.github/workflows/tests.yaml

@@ -17,7 +17,7 @@ jobs:
                 uses: shivammathur/setup-php@v2
                 with:
                     coverage: "none"
-                    php-version: "8.2"
+                    php-version: "8.4"
                     tools: "composer"
 
             -   name: Install vendors
@@ -73,7 +73,7 @@ jobs:
                 id: composer-cache
                 run: echo "::set-output name=dir::$(composer config cache-files-dir)"
 
-            -   uses: actions/cache@v2
+            -   uses: actions/cache@v4
                 with:
                     path: ${{ steps.composer-cache.outputs.dir }}
                     key: ${{ runner.os }}-composer-${{ matrix.php }}