🧹 Update assent, req, and finch

[davoclavo]

• :assent
  • 0.2.9 -> 0.3.1
  • CHANGELOG
  • Required adjusting a couple of things with the Github auth flow, which was tested locally to make sure everything worked
• :req
  • 0.5.10 -> 0.5.15 + a couple of unreleased improvements in the main branch
  • CHANGELOG
  • Required adjusting how we handled compress_body: true in some of our sink tests. I manually disabled compression for now, but we could revert these changes once this fix is merged
  • The additional commits that we deployed are to ensure that our Req.Test.expect are validated properly in conjunction with Hammox.expect calls
• :finch
  • 0.19.0 -> 0.20.0
  • CHANGELOG
  • No changes required

Fixes #2000