Bump regexp.prototype.flags from 1.2.0 to 1.3.0 (#13468)

Bump regexp.prototype.flags from 1.2.0 to 1.3.0 (#13468)

Bumps [regexp.prototype.flags](https://github.com/es-shims/RegExp.prototype.flags) from 1.2.0 to 1.3.0.
- [Release notes](https://github.com/es-shims/RegExp.prototype.flags/releases)
- [Changelog](https://github.com/es-shims/RegExp.prototype.flags/blob/master/CHANGELOG.md)
- [Commits](https://github.com/es-shims/RegExp.prototype.flags/compare/v1.2.0...v1.3.0)

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