fix: Upgrade GitHub Action to use Node v16 (#207)

Co-authored-by: Martin Migasiewicz <71527391+martinmigasiewicz-tomtom@users.noreply.github.com>

action.yml

@@ -2,7 +2,7 @@ name: semantic-pull-request
 author: Jan Amann <jan@amann.me>
 description: Ensure your PR title matches the Conventional Commits spec (https://www.conventionalcommits.org/).
 runs:
-  using: 'node12'
+  using: 'node16'
   main: 'dist/index.js'
 branding:
   icon: 'shield'