Update dependency supertest to v6.2.3

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
supertest	6.2.2 -> 6.2.3

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Release Notes

visionmedia/supertest

### [`v6.2.3`](https://togithub.com/visionmedia/supertest/releases/v6.2.3) [Compare Source](https://togithub.com/visionmedia/supertest/compare/v6.2.2...v6.2.3) - chore: bump deps [`6329e2d`](https://togithub.com/visionmedia/supertest/commit/6329e2d) - Merge pull request [#​759](https://togithub.com/visionmedia/supertest/issues/759) from francescobarbera/master [`e6d371c`](https://togithub.com/visionmedia/supertest/commit/e6d371c) - docs: add an example for complex object in multipart upload [`729e818`](https://togithub.com/visionmedia/supertest/commit/729e818)

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