chore(deps): update dependency supertest to v6

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
supertest	^5.0.0 -> ^6.0.0

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Release Notes

visionmedia/supertest

### [`v6.0.1`](https://togithub.com/visionmedia/supertest/releases/v6.0.1) [Compare Source](https://togithub.com/visionmedia/supertest/compare/v6.0.0...v6.0.1) - Merge pull request [#​682](https://togithub.com/visionmedia/supertest/issues/682) from vukanac/master [`a4c4596`](https://togithub.com/visionmedia/supertest/commit/a4c4596) - Removes space in front of backticks for code blocks in README.md [`f635fce`](https://togithub.com/visionmedia/supertest/commit/f635fce) ### [`v6.0.0`](https://togithub.com/visionmedia/supertest/releases/v6.0.0) [Compare Source](https://togithub.com/visionmedia/supertest/compare/v5.0.0...v6.0.0) - Merge pull request [#​515](https://togithub.com/visionmedia/supertest/issues/515) from holidaycheck/set-host-header-instead-of-adapting-url [`7114571`](https://togithub.com/visionmedia/supertest/commit/7114571) - Set host header instead of host in url [`de056d2`](https://togithub.com/visionmedia/supertest/commit/de056d2)

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[github-actions[bot]]

:tada: This PR is included in version 3.0.0 :tada:

The release is available on:

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

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