Update ghcr.io/apollographql/router Docker tag to v2.2.1 (#685)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

federation/gateways/apollo-router/docker-compose.yaml

@@ -1,6 +1,6 @@
 services:
   gateway:
-    image: ghcr.io/apollographql/router:v2.2.0
+    image: ghcr.io/apollographql/router:v2.2.1
     container_name: gateway
     networks:
       - test