Fix date serialization errors in FormData. Update bodySerializer.ts

[LZQCN]

Fix date serialization errors in FormData.
The correct value is'2025-07-31T09:40:13.599Z'instead of'"2025-07-31T09:40:13.599Z"'

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Name	Status	Preview	Comments	Updated (UTC)
hey-api-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 31, 2025 9:44am

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 22.53%. Comparing base (b9dc166) to head (69fd7cb).
⚠️ Report is 33 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2375   +/-   ##
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  Coverage   22.53%   22.53%           
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  Files         324      324           
  Lines       31840    31840           
  Branches     1232     1232           
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  Hits         7174     7174           
  Misses      24657    24657           
  Partials        9        9           

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commit: 69fd7cb

[mrlubos]

Hey @LZQCN you've only updated an example in this pull request, i.e. this doesn't fix anything. What you're looking for is probably https://github.com/hey-api/openapi-ts/blob/main/packages/openapi-ts/src/plugins/%40hey-api/client-core/bundle/bodySerializer.ts#L17. Could you also add a test so we can verify it fixes the issue?