chore(deps): update dependency supertest to v6.1.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
supertest	6.1.3 -> 6.1.6

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Release Notes

visionmedia/supertest

v6.1.6

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• Merge pull request #​735 from benjosantony/master 28116f9
• Add on to the mitigation in https://github.com/visionmedia/supertest/pull/728/commits to support empty array response body ed0f68d

v6.1.5

Compare Source

• Merge pull request #​728 from swantzter/fix/array-of-statuses-body 3c46dae
• Mitigate array-of-statuses' impact on JSON bodies 5a6999a

v6.1.4

Compare Source

• Merge pull request #​715 from juanvillegas/feature/allows-expect-to-take-an-array 7e4645c
• Allows expect to accept an array of statuses ab252f3

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