fix: updated php version of the test action

Author: FabianKoehnen

.github/workflows/test.yml

@@ -14,7 +14,7 @@ jobs:
             -   name: Configure PHP
                 uses: shivammathur/setup-php@v2
                 with:
-                    php-version: '7.4'
+                    php-version: '8.0'
                     tools: composer:v2
                     coverage: xdebug
                     extensions: bcmath, gd