fix(core): equals sign breaks the "Import from cURL" functionality for HTTP node

[restyler]

Summary

"Import from cURL" functionality for HTTP node is broken for some POSTed JSON data.
= sign is encoded incorrectly on JSON import due to outdated curlconverter dependency. I verified that newer curlconverter versions are working correctly. (I am new to n8n development so I apologize if I missed something in this PR)

Related Linear tickets, Github issues, and Community forum posts

#9768

[CLAassistant]

All committers have signed the CLA.

[netroy]

From what I can tell curlconverter@4 is an ESM only package, and n8n can't use ESM right now.
To solve this we either need to update n8n, and all its dependencies to be ESM, or ask curlconverter to publish a package that works with CJS and ESM both.
The third option would be find the actual fix in curlconverter@4, back-port it to 3.x, send them a PR, ask them to publish a 3.x version, and then update that version here.

[ivov]

Tracking: https://linear.app/n8n/issue/PAY-1681

[restyler]

It turned out that the problem is in query-string package which is used in generators/json.js dependency of the curlconverter.
https://github.com/curlconverter/curlconverter/blob/v3.21.0/generators/json.js#L48

this is where the string gets corrupted.
The funny thing is that latest query-string@7 contains the error, and query-string@8 is ESM-only, pretty much like latest curlconverter.

I can get the latest version of this json generator from v4 branch:
https://github.com/curlconverter/curlconverter/blob/v4.10.1/src/generators/json.ts - and convert it to Javascript (since curlconverter@3 is JS, not TS) but this is definitely not a 3 or 5 line change - do you think this would make sense to back-port?

[netroy]

do you think this would make sense to back-port

Do you mean back-port the fix in curlconverter? I think that's the decision for the maintainers of curlconverter.