fix: json parse err when http node send request

[litterGuy]

When the node sends an http request parameter with \n\t\r, the json conversion error ValueError: Invalid control character at: line 1 column 8363 (char 8362)

Summary

When the request parameter carries '\t', '\n', '\r' and is sent in application/json format, an error "ValueError: Invalid control character at: line 1 column 8363 (char 8362)" will be reported.

Checklist

Important

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• This change requires a documentation update, included: Dify Document
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• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
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