chore(deps): update envoyproxy/envoy docker tag to v1.31 (#184)

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

Author: renovate[bot]

docker-compose.yml

@@ -20,7 +20,7 @@ services:
       - app-net
 
   envoy-app:
-    image: envoyproxy/envoy:v1.30-latest
+    image: envoyproxy/envoy:v1.31-latest
     command: envoy -c /etc/envoy/envoy.yaml --component-log-level ext_authz:trace
     volumes:
       - ./hack/envoy-config.app.yaml:/etc/envoy/envoy.yaml:ro
@@ -39,7 +39,7 @@ services:
       - app-net
 
   envoy-api:
-    image: envoyproxy/envoy:v1.30-latest
+    image: envoyproxy/envoy:v1.31-latest
     command: envoy -c /etc/envoy/envoy.yaml --component-log-level ext_authz:trace
     volumes:
       - ./hack/envoy-config.api.yaml:/etc/envoy/envoy.yaml:ro