fix(proxy url): change ChatGPTUnofficialProxyAPI default proxy server🛩️

[24min]

acheong08 said in this PR:

My proxy also works now but on a different path. It might not be stable enough for consistent use though.

On another note, the unofficial APIs should probably be deprecated. OpenAI has not been happy with them and has since issued multiple takedown requests to different ones (I haven't gotten one yet though).

So,I changed the default proxy server:

https://github.com/transitive-bullshit/chatgpt-api/pull/540#issuecomment-1514010945