add php 8.4 test

Author: nadar

.github/workflows/tests.yml

@@ -37,7 +37,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        php: ['8.0', '8.1', '8.2', '8.3']
+        php: ['8.0', '8.1', '8.2', '8.3', '8.4']
     steps:
       ## checkout the repoistory
       - name: Checkout Repo
@@ -66,7 +66,7 @@ jobs:
       ## run unit tests
       - name: PHP Unit tests for PHP 
         run: vendor/bin/phpunit --verbose --configuration actions.phpunit.xml
-        if: matrix.php == '8.3' || matrix.php == '8.2' || matrix.php == '8.1'
+        if: matrix.php == '8.4' || matrix.php == '8.3' || matrix.php == '8.2' || matrix.php == '8.1'
 
       ## unit test with coverage
       - name: PHP Unit tests for PHP 8.0