Add PHP 8.4 to CI workflow tests

Author: ElGigi

.github/workflows/tests.yml

@@ -11,13 +11,13 @@ jobs:
         continue-on-error: ${{ !matrix.stable }}
         strategy:
             matrix:
-                php-versions: ['8.0', '8.1', '8.2', '8.3']
+                php-versions: ['8.0', '8.1', '8.2', '8.3', '8.4']
                 stable: [true]
                 coverage: [true]
                 composer-flags: ['']
 
         steps:
-            - uses: actions/checkout@v2
+            - uses: actions/checkout@v4
               with:
                 fetch-depth: 0
 
@@ -34,4 +34,4 @@ jobs:
               if: ${{ !matrix.coverage }}
 
             - run: vendor/bin/phpunit --coverage-text --coverage-clover=coverage.clover
-              if: ${{ matrix.coverage }}
+              if: ${{ matrix.coverage }}