chore: bump proxy-agent from 5.0.0 to 6.2.1 (#6247)

* chore: bump proxy-agent from 5.0.0 to 6.2.1

Bumps [proxy-agent](https://github.com/TooTallNate/proxy-agents/tree/HEAD/packages/proxy-agent) from 5.0.0 to 6.2.1.
- [Release notes](https://github.com/TooTallNate/proxy-agents/releases)
- [Changelog](https://github.com/TooTallNate/proxy-agents/blob/main/packages/proxy-agent/CHANGELOG.md)
- [Commits](https://github.com/TooTallNate/proxy-agents/commits/proxy-agent@6.2.1/packages/proxy-agent)

---
updated-dependencies:
- dependency-name: proxy-agent
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

* Update proxy-agent usage

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Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Asher <ash@coder.com>