build: update node version to 16

Dockerfile

@@ -14,7 +14,7 @@ RUN apt-get update \
   && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 
 # Source and install.
-RUN curl -sL https://deb.nodesource.com/setup_12.x | bash - \
+RUN curl -sL https://deb.nodesource.com/setup_16.x | bash - \
   && curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - \
   && echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list \
   && curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add - \