Update tigersmannheim/auto-referee Docker tag to v1.5.2

Author: renovate[bot]

docker-compose.yaml

@@ -197,7 +197,7 @@ services:
       - guacamole
 
   autoref-tigers:
-    image: tigersmannheim/auto-referee:1.5.0
+    image: tigersmannheim/auto-referee:1.5.2
     # Run with UI (note: need to connect to the UI once to start the autoRef)
     # command: [ "vnc", "-a" ]
     # Run without UI in active mode