Bump nodejs to 16

Author: thomaseizinger

CHANGELOG.md

@@ -14,6 +14,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Support for adding team reviewers by setting `team_reviewers`
 - Support for adding assignees by setting `assignees`
 
+### Changed
+
+- Execute action using `node16` instead of `node12` which is now deprecated.
+
 ## [1.2.0] - 2021-07-26
 
 ### Added

action.yml

@@ -44,5 +44,5 @@ outputs:
   html_url:
     description: 'URL that Pull Request may be reviewed at'
 runs:
-  using: 'node12'
+  using: 'node16'
   main: 'dist/index.js'