Bump regexp.prototype.flags from 1.5.0 to 1.5.1

Bumps [regexp.prototype.flags](https://github.com/es-shims/RegExp.prototype.flags) from 1.5.0 to 1.5.1.
- [Changelog](https://github.com/es-shims/RegExp.prototype.flags/blob/main/CHANGELOG.md)
- [Commits](es-shims/RegExp.prototype.flags@v1.5.0...v1.5.1)

---
updated-dependencies:
- dependency-name: regexp.prototype.flags
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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