Fix on encoder embeddings check

[italianconcerto]

No description provided.

[github-actions]

PR Analysis

• 🎯 Main theme: This PR is about fixing a type check in the encoder function of the semantic router.
• 📝 PR summary: The PR modifies the type check in the encoder function of the semantic router. Instead of checking if the response from the OpenAI API is a dictionary, it now checks if it's an instance of the CreateEmbeddingResponse class. This change ensures that the type check is more accurate and specific.
• 📌 Type of PR: Bug fix
• 🧪 Relevant tests added: No
• ⏱️ Estimated effort to review [1-5]: 1, because the PR is small and straightforward, with only a minor change in type checking.
• 🔒 Security concerns: No security concerns found

PR Feedback

• 💡 General suggestions: The PR is concise and focuses on a specific issue, which is good. However, it would be beneficial to include tests that verify the new type check works as expected. Also, it would be helpful to provide more context in the PR description about why this change was necessary.

• 🤖 Code feedback:

  ---

  relevant file	semantic_router/encoders/openai.py
  suggestion	Consider adding a comment explaining why the type check was changed from a dictionary to CreateEmbeddingResponse. This would help future contributors understand the reason behind this change. [medium]
  relevant line	if isinstance(embeds, CreateEmbeddingResponse) and "data" in embeds:

  ---

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[simjak]

@italianconcerto looks good, could you check lint and test