Update Gitea version to use latest stable version

docs/third_party-gitea.md

@@ -7,7 +7,7 @@ version: '2.1'
 services:
 
 		gitea-mailcow:
-			image: gitea/gitea:latest
+			image: gitea/gitea:1
 			volumes:
 				- ./data/gitea:/data
 			networks:
@@ -49,4 +49,4 @@ SSH_PORT = 4000
 ROOT_URL = https://mx.example.org/gitea/
 ```
 
-9\. Restart gitea with `docker-compose restart gitea-mailcow`. Your users should be able to login with mailcow managed accounts.
+9\. Restart gitea with `docker-compose restart gitea-mailcow`. Your users should be able to login with mailcow managed accounts.