change node version in Dockerfile and package.json#2

monsad wants to merge 1 commit intomastermageops/aws-lambda-node-coordinator:masterfrom

MIC-1092-Lambda-end-of-support-for-Node.js-18mageops/aws-lambda-node-coordinator:MIC-1092-Lambda-end-of-support-for-Node.js-18Copy head branch name to clipboard