Update GH Actions dependencies (#197)

- actions/checkout to @5
- ramsey/composer-install to @3

Author: akrabat

.github/workflows/tests.yml

@@ -13,7 +13,7 @@ jobs:
 
         steps:
             - name: Checkout
-              uses: actions/checkout@v2
+              uses: actions/checkout@v5
 
             - name: Set up PHP ${{ matrix.php }}
               uses: shivammathur/setup-php@v2
@@ -22,7 +22,7 @@ jobs:
                   coverage: xdebug
 
             - name: Install dependencies with Composer
-              uses: ramsey/composer-install@v1
+              uses: ramsey/composer-install@v3
 
             - name: Coding standards
               run: vendor/bin/phpcs