message: release: cut the v12.1.0 release
diff: {
  "name": "angular-srcs",
  - "version": "12.1.0-next.6",
  + "version": "12.1.0",
  "private": true,
  "description": "Angular - a web framework for modern web apps",
  "homepage": "https://github.com/angular/angular",
  