Update actionloop builder to 1.18 (#126)

Author: Luke-Roy-IBM

core/CHANGELOG.md

@@ -18,6 +18,8 @@
 -->
 
 # Python 3 OpenWhisk Runtime Container
+## Next Release
+  - Golang Action loop updatetd to golang 1.18
 
 ## 1.17.0
  - Build actionloop from 1.16@1.18.0 (#113)

core/python39Action/Dockerfile

@@ -16,7 +16,7 @@
 #
 
 # build go proxy from source
-FROM golang:1.16 AS builder_source
+FROM golang:1.18 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 @@ RUN git clone --branch ${GO_PROXY_GITHUB_BRANCH} \
    mv proxy /bin/proxy
 
 # or build it from a release
-FROM golang:1.16 AS builder_release
-ARG GO_PROXY_RELEASE_VERSION=1.16@1.19.0
+FROM golang:1.18 AS builder_release
+ARG GO_PROXY_RELEASE_VERSION=1.18@1.19.0
 RUN curl -sL \
   https://github.com/apache/openwhisk-runtime-go/archive/{$GO_PROXY_RELEASE_VERSION}.tar.gz\
   | tar xzf -\