Fix maria db tests

Signed-off-by: Joas Schilling <coding@schilljs.com>

.github/workflows/integration.yml

@@ -83,7 +83,7 @@ jobs:
 
     services:
       mysql:
-        image: mariadb
+        image: mariadb:10.5
         ports:
           - 4444:3306/tcp
         env:

.github/workflows/phpunit.yml

@@ -82,7 +82,7 @@ jobs:
 
     services:
       mysql:
-        image: mariadb
+        image: mariadb:10.5
         ports:
           - 4444:3306/tcp
         env: