[peer keepalive cleanup] client_heartbeat -> system_pong only*

Author: raiden-staging

images/chromium-headful/Dockerfile

@@ -32,8 +32,7 @@ RUN set -eux; \
     make -j$(nproc); \
     make install;
 
-# FROM ghcr.io/onkernel/neko/base:3.0.6-v1.0 AS neko
-FROM ghcr.io/raiden-staging/neko/base:3.0.6-v1.0.1 AS neko
+FROM ghcr.io/onkernel/neko/base:3.0.6-v1.0.1 AS neko
 # ^--- now has event.SYSTEM_PONG with legacy support to keepalive
 FROM docker.io/ubuntu:22.04