fix: correct signup response type

[jkdowdle]

Motivation

auth api will now return username and email on success /signup

[loscm]

Requested review from a random @lifeomic/security team member, @0xVex, due to term: auth.

This review is not blocking and is for broader awareness. Consider if this change requires deeper security review and ask when it is necessary.

• Automation | #pr-flagged-sec-review

[github-actions[bot]]

:tada: This PR is included in version 3.6.1 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: