use runtime-go 1.22.0 (#80)

diff --git a/core/ruby2.6ActionLoop/Dockerfile b/core/ruby2.6ActionLoop/Dockerfile
index f1844a7..2ec847e 100644
--- a/core/ruby2.6ActionLoop/Dockerfile
+++ b/core/ruby2.6ActionLoop/Dockerfile
@@ -26,7 +26,7 @@
 
 # or build it from a release
 FROM golang:1.20 AS builder_release
-ARG GO_PROXY_RELEASE_VERSION=1.20@1.21.0
+ARG GO_PROXY_RELEASE_VERSION=1.20@1.22.0
 RUN curl -sL \
   https://github.com/apache/openwhisk-runtime-go/archive/{$GO_PROXY_RELEASE_VERSION}.tar.gz\
   | tar xzf -\