Bump tunnel-agent and request

Bumps [tunnel-agent](https://github.com/mikeal/tunnel-agent) to 0.6.0 and updates ancestor dependency [request](https://github.com/request/request). These dependencies need to be updated together.


Updates `tunnel-agent` from 0.4.3 to 0.6.0
- [Release notes](https://github.com/mikeal/tunnel-agent/releases)
- [Commits](request/tunnel-agent@v0.4.3...v0.6.0)

Updates `request` from 2.69.0 to 2.88.2
- [Release notes](https://github.com/request/request/releases)
- [Changelog](https://github.com/request/request/blob/master/CHANGELOG.md)
- [Commits](https://github.com/request/request/commits)

---
updated-dependencies:
- dependency-name: tunnel-agent
  dependency-type: indirect
- dependency-name: request
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>