update golang builder version to 1.18 (#93)

Author: Luke-Roy-IBM

swift4.2/CHANGELOG.md

@@ -1,5 +1,14 @@
 # IBM Functions Swift 4.2 Runtime
 
+# 1.4.5
+Changes:
+  - Update Golang Version for the Action Loop Proxy builder
+
+Swift runtime version: [swift-4.2.4-RELEASE](https://swift.org/builds/swift-4.2.4-release/ubuntu1804/swift-4.2.4-RELEASE/swift-4.2.4-RELEASE-ubuntu18.04.tar.gz)
+
+Packages included:
+  - [Watson SDK 1.3.1](https://github.com/watson-developer-cloud/swift-sdk/releases/tag/1.3.1)
+
 # 1.4.4
 Changes:
   - Update GO_PROXY_RELEASE_VERSION to [email protected].

swift4.2/Dockerfile

@@ -4,7 +4,7 @@ FROM openwhisk/action-swift-v4.2:43eef06 AS parent_image
 
 # from https://github.com/apache/openwhisk-runtime-swift/blob/master/core/swift42Action/Dockerfile
 # Build go action-loop proxy from source.
-FROM golang:1.15 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} \
@@ -13,7 +13,7 @@ RUN git clone --branch ${GO_PROXY_GITHUB_BRANCH} \
    mv proxy /bin/proxy
 
 # Build go action-loop proxy from release.
-FROM golang:1.15 AS builder_release
+FROM golang:1.18 AS builder_release
 ARG [email protected]
 RUN curl -sL \
   https://github.com/apache/openwhisk-runtime-go/archive/{$GO_PROXY_RELEASE_VERSION}.tar.gz\