Use Node 16 (#1221)

https://github.blog/changelog/2022-09-22-github-actions-all-actions-will-begin-running-on-node16-instead-of-node12/

action.yml

@@ -2,7 +2,7 @@ name: 'Deploy to GitHub Pages'
 description: 'This action will handle the deployment process of your project to GitHub Pages.'
 author: 'James Ives <[email protected]>'
 runs:
-  using: 'node12'
+  using: 'node16'
   main: 'lib/main.js'
 branding:
   icon: 'git-commit'