build actionloop from 1.16@1.18.0 (#113)

diff --git a/core/python36AiAction/Dockerfile b/core/python36AiAction/Dockerfile
index a6742fd..bb2dab6 100644
--- a/core/python36AiAction/Dockerfile
+++ b/core/python36AiAction/Dockerfile
@@ -16,7 +16,7 @@
 #
 
 # build go proxy from source
-FROM golang:1.15 AS builder_source
+FROM golang:1.16 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:1.15 AS builder_release
-ARG GO_PROXY_RELEASE_VERSION=1.15@1.17.0
+FROM golang:1.16 AS builder_release
+ARG GO_PROXY_RELEASE_VERSION=1.16@1.18.0
 RUN curl -sL \
   https://github.com/apache/openwhisk-runtime-go/archive/${GO_PROXY_RELEASE_VERSION}.tar.gz\
   | tar xzf -\
@@ -37,7 +37,7 @@
 FROM tensorflow/tensorflow:1.15.2-py3-jupyter
 
 # select the builder to use
-ARG GO_PROXY_BUILD_FROM=source
+ARG GO_PROXY_BUILD_FROM=release
 
 RUN apt-get update && apt-get upgrade -y && apt-get install -y \
             curl \
diff --git a/core/python39Action/Dockerfile b/core/python39Action/Dockerfile
index 35ee88c..713a2ea 100644
--- a/core/python39Action/Dockerfile
+++ b/core/python39Action/Dockerfile
@@ -16,7 +16,7 @@
 #
 
 # build go proxy from source
-FROM golang:1.15 AS builder_source
+FROM golang:1.16 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:1.15 AS builder_release
-ARG GO_PROXY_RELEASE_VERSION=1.15@1.17.0
+FROM golang:1.16 AS builder_release
+ARG GO_PROXY_RELEASE_VERSION=1.16@1.18.0
 RUN curl -sL \
   https://github.com/apache/openwhisk-runtime-go/archive/{$GO_PROXY_RELEASE_VERSION}.tar.gz\
   | tar xzf -\
@@ -36,7 +36,7 @@
 FROM python:3.9-buster
 
 # select the builder to use
-ARG GO_PROXY_BUILD_FROM=source
+ARG GO_PROXY_BUILD_FROM=release
 
 # Install common modules for python
 COPY requirements.txt requirements.txt
diff --git a/core/python3Action/Dockerfile b/core/python3Action/Dockerfile
index 870cef6..ef4615a 100644
--- a/core/python3Action/Dockerfile
+++ b/core/python3Action/Dockerfile
@@ -16,7 +16,7 @@
 #
 
 # build go proxy from source
-FROM golang:1.15 AS builder_source
+FROM golang:1.16 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:1.15 AS builder_release
-ARG GO_PROXY_RELEASE_VERSION=1.15@1.17.0
+FROM golang:1.16 AS builder_release
+ARG GO_PROXY_RELEASE_VERSION=1.16@1.18.0
 RUN curl -sL \
   https://github.com/apache/openwhisk-runtime-go/archive/{$GO_PROXY_RELEASE_VERSION}.tar.gz\
   | tar xzf -\
@@ -36,7 +36,7 @@
 FROM python:3.7-buster
 
 # select the builder to use
-ARG GO_PROXY_BUILD_FROM=source
+ARG GO_PROXY_BUILD_FROM=release
 
 # Install common modules for python
 COPY requirements.txt requirements.txt