Adds faraday to Gemfile

[mikelrob]

We observe the following failure

bundler: failed to load command: fastlane (/Users/distiller/.gem/ruby/2.7.5/bin/fastlane)
NameError: [!] uninitialized constant Faraday::UploadIO
  /Users/distiller/.gem/ruby/2.7.5/gems/fastlane-plugin-appcenter-1.11.1/lib/fastlane/plugin/appcenter/helper/appcenter_helper.rb:254:in `block (2 levels) in upload_symbol'
  /Users/distiller/.gem/ruby/2.7.5/gems/faraday-1.9.1/lib/faraday/connection.rb:513:in `block in run_request'
  /Users/distiller/.gem/ruby/2.7.5/gems/faraday-1.9.1/lib/faraday/connection.rb:530:in `block in build_request'
  /Users/distiller/.gem/ruby/2.7.5/gems/faraday-1.9.1/lib/faraday/request.rb:57:in `block in create'
  /Users/distiller/.gem/ruby/2.7.5/gems/faraday-1.9.1/lib/faraday/request.rb:56:in `tap'
  /Users/distiller/.gem/ruby/2.7.5/gems/faraday-1.9.1/lib/faraday/request.rb:56:in `create'
  /Users/distiller/.gem/ruby/2.7.5/gems/faraday-1.9.1/lib/faraday/connection.rb:526:in `build_request'
  /Users/distiller/.gem/ruby/2.7.5/gems/faraday-1.9.1/lib/faraday/connection.rb:508:in `run_request'
  /Users/distiller/.gem/ruby/2.7.5/gems/faraday-1.9.1/lib/faraday/connection.rb:281:in `put'
  /Users/distiller/.gem/ruby/2.7.5/gems/fastlane-plugin-appcenter-1.11.1/lib/fastlane/plugin/appcenter/helper/appcenter_helper.rb:250:in `block in upload_symbol'
  /Users/distiller/.gem/ruby/2.7.5/gems/fastlane-plugin-appcenter-1.11.1/lib/fastlane/plugin/appcenter/helper/appcenter_helper.rb:1006:in `retry_429_and_error'
  /Users/distiller/.gem/ruby/2.7.5/gems/fastlane-plugin-appcenter-1.11.1/lib/fastlane/plugin/appcenter/helper/appcenter_helper.rb:249:in `upload_symbol'
  /Users/distiller/.gem/ruby/2.7.5/gems/fastlane-plugin-appcenter-1.11.1/lib/fastlane/plugin/appcenter/actions/appcenter_upload_action.rb:98:in `run_dsym_upload'
  /Users/distiller/.gem/ruby/2.7.5/gems/fastlane-plugin-appcenter-1.11.1/lib/fastlane/plugin/appcenter/actions/appcenter_upload_action.rb:359:in `run'

UploadIO was removed from faraday. The last compatible version containing UploadIO was 1.5.1

[DmitriyKirakosyan]

@mikelrob , are you still interested in these changes?

[mikelrob]

No thanks. Haven't used it in years now.