Bump angular in /grr/server/grr_response_server/gui/static

Bumps [angular](https://github.com/angular/angular.js) from 1.8.2 to 1.8.3.
- [Changelog](https://github.com/angular/angular.js/blob/master/CHANGELOG.md)
- [Commits](angular/angular.js@v1.8.2...v1.8.3)

---
updated-dependencies:
- dependency-name: angular
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>