Node 16 as default runtime (#169)

Co-authored-by: CrazyMax <crazy-max@users.noreply.github.com>

action.yml

@@ -23,5 +23,5 @@ inputs:
     required: false
 
 runs:
-  using: 'node12'
+  using: 'node16'
   main: 'dist/index.js'

dev.Dockerfile

@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1
 
-ARG NODE_VERSION=12
+ARG NODE_VERSION=16
 
 FROM node:${NODE_VERSION}-alpine AS base
 RUN apk add --no-cache cpio findutils git