refactor: Make bigger connection pool for postgreSQL (#1399)

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## Description
Increase default postgres connection pool 

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cognee/infrastructure/databases/relational/sqlalchemy/SqlAlchemyAdapter.py

@@ -58,8 +58,8 @@ class SQLAlchemyAdapter:
         else:
             self.engine = create_async_engine(
                 connection_string,
-                pool_size=5,
-                max_overflow=10,
+                pool_size=20,
+                max_overflow=20,
                 pool_recycle=280,
                 pool_pre_ping=True,
                 pool_timeout=280,