refactor: Add Kuzu buffer change (#1094)

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## Description
Change Kuzu default buffer size

## DCO Affirmation
I affirm that all code in every commit of this pull request conforms to
the terms of the Topoteretes Developer Certificate of Origin.

cognee/infrastructure/databases/graph/kuzu/adapter.py

@@ -54,8 +54,8 @@ class KuzuAdapter(GraphDBInterface):
 
                 self.db = Database(
                     self.temp_graph_file,
-                    buffer_pool_size=256 * 1024 * 1024,  # 256MB buffer pool
-                    max_db_size=1024 * 1024 * 1024,
+                    buffer_pool_size=2048 * 1024 * 1024,  # 2048MB buffer pool
+                    max_db_size=4096 * 1024 * 1024,
                 )
             else:
                 # Ensure the parent directory exists before creating the database