chore(deps-dev): bump supertest from 6.1.5 to 6.1.6 (#3665)

Bumps [supertest](https://github.com/visionmedia/supertest) from 6.1.5 to 6.1.6. - [Release notes](https://github.com/visionmedia/supertest/releases) - [Commits](forwardemail/supertest@v6.1.5...v6.1.6) --- updated-dependencies: - dependency-name: supertest dependency-type: direct:development update-type: version-update:semver-patch ... Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]