Update Apple auth URLs

[interstateone]

The URLs we were using were originally from the xcode-install project and had been working up until today (2019/11/12). These URLs were updated in that project (actually in fastlane, which it uses for auth) about 7 months ago but I didn't notice this. I started to look in a web inspector while signing in to developer.apple.com and saw that the Olympus session URL changed. Dave DeLong noted that a slightly different URL worked for the iTC service key, which is also what xcinfo uses.

Testing

1. Delete the com.robotsandpencils.xcodes keychain item
2. swift run xcodes update should complete by printing out all the available Xcode versions which as of today should end with 11.2.1

Resolves #83

[MattKiazyk]

Note: I didn't delete the keychain item before - but it did prompt me for keychain access again. After typing in my password nothing happened on the console. xcodes update then connected properly and printed out the correct versions.

9.4
9.4.1
10.0
10.1
10.2 (Installed)
10.2.1
10.3
11.0
11.1 GM Seed (11A1027) (Installed)
11.1
11.2
11.2.1

[interstateone]

Adding to the record from a side conversation: prompting for keychain access is expected sometimes, but not printing anything (error or list) is not expected. I can't reproduce locally right now but will note for a future fix.