fix: make `input` of `.required()` readonly

[KATT]

More info: https://github.com/trpc/trpc/issues/5538

Unsure if this is a legit fix. I could see this working as designed.

cc @tkdodo @PeterMK85

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[PeterMK85]

Yep fix confirmed, in the use case seems solved

[colinhacks]

This has landed in Zod 3.23.

https://github.com/colinhacks/zod/releases/tag/v3.23.0