chore(deps): update dependency supertest to v6.3.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
supertest	6.3.0 -> 6.3.1

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Release Notes

visionmedia/supertest

v6.3.1

Compare Source

• fix: bump superagent (closes #​798) 25122e6

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