[FEATURE] Add Cohere rerank-v3.5

[asyrkovsky]

Describe the feature you'd like
Add Cohere rerank-v3.5, now only 2.0 version is available.

[chiyuany]

Hello! This is my first time contributing to an open-source project. It looks like the requested feature involves a minor update to the CohereRerankRetriever file. Could you assign this issue to me? I'd love to work on it as my first contribution.

[deepak0x]

Hey @HenryHengZJ — looks like this is already done. The Cohere Rerank node has rerank-v3.5 as the default now, plus rerank-english-v3.0 and rerank-multilingual-v3.0. The old v2.0 models are gone. Probably safe to close this one.