Bump deep-equal from 2.1.0 to 2.2.1

Bumps [deep-equal](https://github.com/inspect-js/node-deep-equal) from 2.1.0 to 2.2.1.
- [Changelog](https://github.com/inspect-js/node-deep-equal/blob/master/CHANGELOG.md)
- [Commits](inspect-js/node-deep-equal@v2.1.0...v2.2.1)

---
updated-dependencies:
- dependency-name: deep-equal
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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