Bumps [angular](https://github.com/angular/angular.js) from 1.7.6 to 1.7.7.
- [Release notes](https://github.com/angular/angular.js/releases)
- [Changelog](https://github.com/angular/angular.js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/angular/angular.js/compare/v1.7.6...v1.7.7)
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