Allow Faraday v2.0.1+ to be used

Note that Faraday v2.0.0 doesn't work since the net_http gem is only in v2.0.1: https://github.com/lostisland/faraday/blob/main/UPGRADING.md

Relates to:

• https://gitlab.com/gitlab-org/ci-cd/test_file_finder/-/issues/23
• gitlab-org/gitlab#408884 (closed)