fix: Fix mypy error in __exit__ method return type

Changed __exit__ return type from bool to None as it should not
return False explicitly. This fixes the mypy type checking error.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: tpayet

meilisearch/client.py

@@ -792,10 +792,9 @@ def __enter__(self) -> "Client":
         """Support using the client as a context manager."""
         return self
 
-    def __exit__(self, exc_type: Any, exc_val: Any, exc_tb: Any) -> bool:
+    def __exit__(self, exc_type: Any, exc_val: Any, exc_tb: Any) -> None:
         """Clean up when exiting the context manager."""
         self.close()
-        return False
 
     def __del__(self) -> None:
         """Ensure cleanup on object destruction."""