Upgrade jhipster-registry to v6.7.1

[pascalgrimaud]

Following:

• https://github.com/jhipster/jhipster-registry/releases/tag/v6.7.1
• https://github.com/jhipster/jhipster-control-center/releases/tag/v0.4.1

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Please make sure the below checklist is followed for Pull Requests.

• All continuous integration tests are green
• Tests are added where necessary
• jhipster-online was updated if necessary
• Documentation is added/updated where necessary
• Coding Rules & Commit Guidelines as per our CONTRIBUTING.md document are followed

When you are still working on the PR, consider converting it to Draft (bellow reviewers) and adding skip-ci label, you can still see CI build result at your branch.

[pascalgrimaud]

The JHipster Registry v6.7.0 is broken with OAuth2
I'm working on it to fix it, and try to do another release v6.7.1