sorbet-runtime.rbi: use typed: strict

[samford]

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sorbet/rbi/shims/sorbet-runtime.rbi was recently added and since then brew typecheck has been surfacing an offense due to this file using typed: true instead of typed: strict ("Sorbet/StrictSigil: Sorbet sigil should be at least strict got true."). This updates the sigil to typed: strict, as brew typecheck seems to be fine with it and I didn't see any issues when running brew tests.

Of course, let me know if this isn't a good idea (e.g., if this uses typed: true because there are known issues when using typed: strict).

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[ZhongRuoyu]

Thanks!