Update robocupssl/ssl-game-controller Docker tag to v3.20.2

Author: renovate[bot]

docker-compose.yaml

@@ -12,7 +12,7 @@ services:
     restart: on-failure
 
   ssl-game-controller:
-    image: robocupssl/ssl-game-controller:3.18.2@sha256:d794a1527b45ba62e57d7d389185ce64905ece2b5e1cf4a53c0d7350c6eee9cf
+    image: robocupssl/ssl-game-controller:3.20.2@sha256:09ba4825157e0293f57393ade7c5c9a4a9703f2872f71cc1c51d72916a27aed9
     command: [ "-address", "localhost:8081" ]
     network_mode: host
     restart: on-failure