fix: set mariadb image to 10.5 (#163)

Signed-off-by: Friedrich Greiner <greinerfriedrich@gmail.com>

nextcloud-redis-mariadb/docker-compose.yaml

@@ -24,7 +24,7 @@ services:
     expose:
       - 6379
   db:
-    image: mariadb
+    image: mariadb:10.5
     command: --transaction-isolation=READ-COMMITTED --binlog-format=ROW
     restart: always
     volumes: