Merge pull request #89 from codimd/dependabot/docker/debian/node-12.16.2-slim

Bump node from 12.16.1-slim to 12.16.2-slim in /debian

debian/Dockerfile

-FROM node:12.16.1-slim
+FROM node:12.16.2-slim
 
 # Build arguments to change source url, branch or tag
 ARG CODIMD_REPOSITORY=https://github.com/codimd/server.git