fastlane: Spaceship::TunesClient::ITunesConnectError: invalid request body

New Issue Checklist

• Updated fastlane to the latest version
• I have read the Contribution Guidelines

Issue Description

Receiving Spaceship::TunesClient::ITunesConnectError: invalid request body when calling Spaceship::Tunes.select_team. The request to set the team id on line 88 is returning HTTP 400. Here is the response body:

{
  "data"=>nil,
  "messages"=>{"warn"=>nil, "error"=>["invalid request body"], "info"=>nil}, 
  "statusCode"=>"ERROR"
}

I did some digging with switching teams in ITC and it looks like Spaceship needs the dsId param in the ra/v1/session/webSession. Once I added this param to the request, I received a 200 and everything worked as expected.

response = request(:post) do |req|
  req.url "ra/v1/session/webSession"
  req.body = { contentProviderId: team_id, dsId: 'mydsid' }.to_json
  req.headers['Content-Type'] = 'application/json'
end

Note: by the time i got this posted there was a duplicate: #6710 . sorry about that