fix: valibot variants not inferring required correctly

[jack-allocate]

🔎 Overview

Similar to #5014

I use the required field on useField#meta to automatically show an "Optional" text on an input. I found that having v.variant breaks this.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 12616ef

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[codecov]

Codecov Report

Attention: Patch coverage is 94.11765% with 1 line in your changes missing coverage. Please review.

Project coverage is 89.37%. Comparing base (9803aa2) to head (12616ef).

Files with missing lines	Patch %	Lines
packages/valibot/src/index.ts	94.11%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5031      +/-   ##
==========================================
+ Coverage   89.36%   89.37%   +0.01%     
==========================================
  Files          93       93              
  Lines        8046     8063      +17     
  Branches     1394     1400       +6     
==========================================
+ Hits         7190     7206      +16     
- Misses        849      850       +1     
  Partials        7        7              

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