Deploy to iTunes Connect should use connected Apple accounts

Closing this here as this is indeed a duplicate of Use connected Apple Developer account in workflow steps (@matthias.buchetics :wink: ).

For that we already have a card in our backlog, which was just bumped so that it should be processed soon. Can’t promise anything right now, other than “I did set it to the highest priority” though it might still get de-prioritised along the triaging process.