chore(deps): update dependency supertest to v6.1.5

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
supertest	6.1.4 -> 6.1.5

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Release Notes

visionmedia/supertest

### [`v6.1.5`](https://togithub.com/visionmedia/supertest/releases/v6.1.5) [Compare Source](https://togithub.com/visionmedia/supertest/compare/v6.1.4...v6.1.5) - Merge pull request [#​728](https://togithub.com/visionmedia/supertest/issues/728) from swantzter/fix/array-of-statuses-body [`3c46dae`](https://togithub.com/visionmedia/supertest/commit/3c46dae) - Mitigate array-of-statuses' impact on JSON bodies [`5a6999a`](https://togithub.com/visionmedia/supertest/commit/5a6999a)

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