fix: Update deprecated HTTP status code (topoteretes#2185)

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## Description
Fix deprecated HTTP status usage

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- [ ] Bug fix (non-breaking change that fixes an issue)
- [ ] New feature (non-breaking change that adds functionality)
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<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit

* **Chores**
* Updated error handling status code for improved HTTP compliance in
collection error responses.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: Vasilije1990

cognee/infrastructure/databases/vector/exceptions/exceptions.py

@@ -15,7 +15,7 @@ def __init__(
         self,
         message,
         name: str = "CollectionNotFoundError",
-        status_code: int = status.HTTP_422_UNPROCESSABLE_ENTITY,
+        status_code: int = status.HTTP_422_UNPROCESSABLE_CONTENT,
         log=True,
         log_level="DEBUG",
     ):