Bump axios from 0.21.1 to 0.21.4 in /examples/users-api (#280)

Bumps [axios](https://github.com/axios/axios) from 0.21.1 to 0.21.4.
- [Release notes](https://github.com/axios/axios/releases)
- [Changelog](https://github.com/axios/axios/blob/master/CHANGELOG.md)
- [Commits](axios/axios@v0.21.1...v0.21.4)

---
updated-dependencies:
- dependency-name: axios
  dependency-type: indirect
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Adam Mcgrath <adam.mcgrath@auth0.com>