Bump xml2js and generator-jhipster

Bumps [xml2js](https://github.com/Leonidas-from-XIV/node-xml2js) to 0.5.0 and updates ancestor dependency [generator-jhipster](https://github.com/jhipster/generator-jhipster). These dependencies need to be updated together.


Updates `xml2js` from 0.4.19 to 0.5.0
- [Commits](Leonidas-from-XIV/node-xml2js@0.4.19...0.5.0)

Updates `generator-jhipster` from 7.9.3 to 8.0.0-beta.1
- [Release notes](https://github.com/jhipster/generator-jhipster/releases)
- [Commits](jhipster/generator-jhipster@v7.9.3...v8.0.0-beta.1)

---
updated-dependencies:
- dependency-name: xml2js
  dependency-type: indirect
- dependency-name: generator-jhipster
  dependency-type: direct:development
...

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