Fix UTF-8 encoding for special characters (emoji, accented letters, etc.) by encoding JSON as UTF-8 bytes

[pengfeiye]

License

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Note

Improves request JSON encoding and expands tests.

• In HttpClient._execute, serialize request_body with json.dumps(..., ensure_ascii=False, allow_nan=True) and send as UTF-8 encoded bytes to prevent Latin-1 errors and preserve special characters; keep data path unchanged (e.g., multipart)
• Adjust request invocation to use data= with bytes when JSON is present; honor override timeouts
• Add/modify tests to validate UTF-8 bytes handling (emoji, accented characters, right single quotation mark), NaN/Infinity serialization, None body/data behavior, and multipart unaffected
• Update CHANGELOG.md under Unreleased to note UTF-8 fix

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