Bump generator-jhipster from 8.5.0 to 8.7.1

Bumps [generator-jhipster](https://github.com/jhipster/generator-jhipster) from 8.5.0 to 8.7.1.
- [Release notes](https://github.com/jhipster/generator-jhipster/releases)
- [Commits](jhipster/generator-jhipster@v8.5.0...v8.7.1)

---
updated-dependencies:
- dependency-name: generator-jhipster
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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