Fix faraday warnings

[alex501212]

When running pdksync rake tasks I get these faraday warnings:

To use retry middleware with Faraday v2.0+, install `faraday-retry` gem To use multipart middleware with Faraday v2.0+, install `faraday-multipart` gem; note: this is used by the ManageGHES client for uploading licenses

To fix this I have added 'faraday-retry' and 'faraday-multipart' to the gemspec

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 45.55%. Comparing base (cd745c0) to head (9e4a7f2). Report is 3 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #220 +/- ## ======================================= Coverage 45.55% 45.55% ======================================= Files 10 10 Lines 1216 1216 ======================================= Hits 554 554 Misses 662 662 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.