build actionloop from 1.16@1.19.0 (#70)

diff --git a/core/ruby2.6ActionLoop/Dockerfile b/core/ruby2.6ActionLoop/Dockerfile
index 42b01a5..a481bb3 100644
--- a/core/ruby2.6ActionLoop/Dockerfile
+++ b/core/ruby2.6ActionLoop/Dockerfile
@@ -26,7 +26,7 @@
 
 # or build it from a release
 FROM golang:1.16 AS builder_release
-ARG GO_PROXY_RELEASE_VERSION=1.16@1.18.0
+ARG GO_PROXY_RELEASE_VERSION=1.16@1.19.0
 RUN curl -sL \
   https://github.com/apache/openwhisk-runtime-go/archive/{$GO_PROXY_RELEASE_VERSION}.tar.gz\
   | tar xzf -\