Update Proxy to golang 1.20 (#79)

diff --git a/core/ruby2.6ActionLoop/CHANGELOG.txt b/core/ruby2.6ActionLoop/CHANGELOG.txt
index 4aea849..bc9391a 100644
--- a/core/ruby2.6ActionLoop/CHANGELOG.txt
+++ b/core/ruby2.6ActionLoop/CHANGELOG.txt
@@ -20,7 +20,7 @@
 # Ruby 2.6 OpenWhisk Runtime Container
 
 ## Next Release
-  - Golang Action loop updatetd to golang 1.18
+  - Golang Action loop updatetd to golang 1.20 
 
 ## 1.17.0
   - Build actionloop from 1.16@1.18.0 (#63)
diff --git a/core/ruby2.6ActionLoop/Dockerfile b/core/ruby2.6ActionLoop/Dockerfile
index 834650e..f1844a7 100644
--- a/core/ruby2.6ActionLoop/Dockerfile
+++ b/core/ruby2.6ActionLoop/Dockerfile
@@ -16,7 +16,7 @@
 #
 
 # build go proxy from source
-FROM golang:1.18 AS builder_source
+FROM golang:1.20 AS builder_source
 ARG GO_PROXY_GITHUB_USER=apache
 ARG GO_PROXY_GITHUB_BRANCH=master
 RUN git clone --branch ${GO_PROXY_GITHUB_BRANCH} \
@@ -25,8 +25,8 @@
    mv proxy /bin/proxy
 
 # or build it from a release
-FROM golang:1.18 AS builder_release
-ARG GO_PROXY_RELEASE_VERSION=1.18@1.20.0
+FROM golang:1.20 AS builder_release
+ARG GO_PROXY_RELEASE_VERSION=1.20@1.21.0
 RUN curl -sL \
   https://github.com/apache/openwhisk-runtime-go/archive/{$GO_PROXY_RELEASE_VERSION}.tar.gz\
   | tar xzf -\