fix(zod/v4): drop z.record() with single argument

[colinaaa]

Summary

Replace z.record(<type>) with z.record(z.string(), <type>). Preparing for upgrading to Zod v4.

Note

The default key type of zod v3 is z.string(). See: https://github.com/colinhacks/zod/blob/592de8de6e9c1f1d41aaa68e2c8ba57adced6507/packages/zod/src/v3/types.ts#L3567

issue: #10467

Zod v4: https://zod.dev/v4/changelog#zrecord

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[codspeed-hq]

CodSpeed Performance Report

Merging #10468 will not alter performance

_{Comparing colinaaa:zod-v4 (c6d12eb) with main (3191c8f)}

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Summary

✅ 11 untouched benchmarks