[Worklow_PHP_8] Disable PHP 8.0 for now, as it is not working

Author: lkck24

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       matrix:
         operating-system: [ ubuntu-latest ]
-        php: [ '7.4', '8.0' ]
+        php: [ '7.4' ]
 
     name: PHP ${{ matrix.php }}