typecheck: allow typecheck command to run on Apple Silicon

[dtrodrigues]

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Now that sorbet works on Apple Silicon, allow the typecheck command to run.

Thanks @Bo98!

Closes #10210

[BrewTestBot]

Review period will end on 2021-08-12 at 10:44:33 UTC.

[MikeMcQuaid]

🎉

[BrewTestBot]

Review period skipped due to critical label.