Update dependency superagent to v7

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
superagent	^6.0.0 -> ^7.0.0

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Release Notes

visionmedia/superagent

v7.1.1

• Revert "feat: add lookup method (#​1595)" f99e624
• refactor: make linter happier (#​1671) 9975981

v7.0.2

Compare Source

• package.json: fix invalid syntax in engines (#​1666) e7acafb

v7.0.1

Compare Source

• fix: fixed version range (see [https://github.com/mysticatea/eslint-plugin-node/issues/315](https://togithub.com/mysticatea/eslint-plugin-node/issues/315)5> and closes https://github.com/visionmedia/superagent/issues/166060>) a4c3fd7
• Revert "#​1660: Fix engines syntax in package.json (#​1661)" (#​1662) 37dd15b
• #​1660: Fix engines syntax in package.json (#​1661) d442ae1

v7.0.0

Compare Source

• fix: fixed linting, file size, and README updates for browser compat 152fcbe
• chore: bump lockfile 42b2c67
• fix: fixed security file linting 88daf8b
• fix: add node v16 and drop v10 from tests (lib is still compiled to work down to node v6.4) 81fd7ad
• fix: updated lockfile 0334997
• Fix/tests (#​1659) 9518bfe
• fix: locked mocha back to what it should have been c5ca6fd
• fix: fixed linting issue 120a97b
• fix: added abort fix logic for all Node versions 8b1923d
• Create SECURITY.md (#​1658) 7ac9d42
• chore: bump deps, fixed linting 048cf18
• build: update formidable to 2.0.1 (#​1651) 6ac6429
• chore: bump deps, including form-data (closes #​1267) 3c9c0f7
• Note of the breaking change in browser 6.0 -> 6.1 (#​1614) e2987e3

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