Restore mysql version

Author: renatonascalves

.github/workflows/tests.yml

@@ -11,7 +11,7 @@ jobs:
       matrix:
         php: ['7.4', '8.0', '8.1', '8.2', '8.3', '8.4']
         wp_version: ['latest']
-        mysql: ['5.7']
+        mysql: ['8.0']
         include:
           - php: '7.4'
             wp_version: '6.4'