chore(ui): upgrade to node 16

Author: sranka

Diff for: .nvmrc

@@ -1 +1 @@
-14
+16

Diff for: CONTRIBUTING.md

@@ -45,9 +45,9 @@ If you are going to be contributing back to Chronograf please take a second to s
 
 ## Installing & Using Node
 
-You'll need to install Node 14 to run the frontend chronograf application.
+You'll need to install Node 16 to run the frontend chronograf application.
 
-* [Install Node 14](https://nodejs.org/en/about/releases/)
+* [Install Node 16](https://nodejs.org/en/about/releases/)
 
 ## Installing & Using Yarn
 

Diff for: etc/Dockerfile_build

@@ -20,7 +20,7 @@ RUN pip3 install boto requests python-jose --upgrade
 RUN gem install fpm
 
 # Install node
-ENV NODE_VERSION v14.15.0
+ENV NODE_VERSION v16.14.0
 RUN wget -q https://nodejs.org/dist/${NODE_VERSION}/node-${NODE_VERSION}-linux-x64.tar.gz; \
    mkdir /usr/local/node; \
    tar -xvf node-${NODE_VERSION}-linux-x64.tar.gz -C /usr/local/node --strip-components=1; \