Adds Xcode 13.1 / 2019 iMac 27" 3.6GHz

[briankung]

Checklist

If you have any non-Apple hardware components - submit your results to the Custom Hardware table.

• [x] I performed all steps to correctly run XcodeBenchmark.
• [x] I used Xcode 12.5 or above.
• [x] I attached a screenshot with a compilation time and other fields, here (also below)..
• [x] I confirm that Time column is still sorted.
• [x] The content in cells is centered.

Note: I just realized I used iTerm2 instead of Terminal. I hope that doesn't change the benchmark too much. EDIT - I reran all the steps with Terminal and got a slower time - 177s. I'll leave it as is.