Bump the CI Node.js version from 14.15.4 to 14.16.0 (#92578) (#92633)

This wasn't part of #92421 as Docker Hub wasn't updated at the time.

Co-authored-by: Thomas Watson <w@tson.dk>

.ci/Dockerfile

@@ -1,7 +1,7 @@
 # NOTE: This Dockerfile is ONLY used to run certain tasks in CI. It is not used to run Kibana or as a distributable.
 # If you're looking for the Kibana Docker image distributable, please see: src/dev/build/tasks/os_packages/docker_generator/templates/dockerfile.template.ts
 
-ARG NODE_VERSION=14.15.4
+ARG NODE_VERSION=14.16.0
 
 FROM node:${NODE_VERSION} AS base