update node version to 16

.devcontainer/Dockerfile

@@ -1,5 +1,5 @@
 # Update the VARIANT arg in docker-compose.yml to pick a Node version: 10, 12, 14
-ARG VARIANT="14-buster"
+ARG VARIANT="16-buster"
 FROM mcr.microsoft.com/vscode/devcontainers/typescript-node:0-${VARIANT}
 
 ENV DOCKERDEV=true

.devcontainer/docker-compose.yml

@@ -7,7 +7,7 @@ services:
       dockerfile: Dockerfile
       args:
         # [Choice] Node.js version: 14, 12, 10
-        VARIANT: 14
+        VARIANT: 16
         # On Linux, you may need to update USER_UID and USER_GID below if not your local UID is not 1000.
         USER_UID: 1000
         USER_GID: 1000