chore(deps-dev): bump supertest from 6.3.0 to 6.3.1 (#1372)

Bumps [supertest](https://github.com/visionmedia/supertest) from 6.3.0 to 6.3.1.
- [Release notes](https://github.com/visionmedia/supertest/releases)
- [Commits](forwardemail/supertest@v6.3.0...v6.3.1)

---
updated-dependencies:
- dependency-name: supertest
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]