[spaceship] Fixed deprecated call using Faraday (#14018)
[spaceship] Fixed deprecated call using Faraday (#14018)

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### Checklist
- [x] I've run `bundle exec rspec` from the root directory to see all new and existing tests pass
- [x] I've followed the _fastlane_ code style and run `bundle exec rubocop -a` to ensure the code style is valid
- [x] I've read the [Contribution Guidelines](https://github.com/fastlane/fastlane/blob/master/CONTRIBUTING.md)
- [x] I've updated the documentation if necessary.

### Motivation and Context
I wanted to debug why I can't upload videos to AppStoreConnect using Spaceship, while doing that I noticed a warning about a deprecated Faraday call for setting the proxy. This fixes #14007

### Description
I replaced the now deprecated `proxy(x)` call with `proxy = x`. That seemed like an easy enough task as my first PR ;)

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