chore(deps): update dependency supertest to v7

This MR contains the following updates:

Package	Type	Update	Change
supertest	devDependencies	major	^6.3.3 -> ^7.0.0

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Release Notes

ladjs/supertest

v7.0.0

Compare Source

• Merge pull request #​834 from Bruception/master 225118c
• Fix TestAgent not inheriting Agent properties f290431
• fix: bump deps, drop Node.js v<14.16.0 1e18c20

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