lint: remove a few unused imports (#187)

Author: eyurtsev

tests/unit_tests/v2/test_async_pg_vectorstore_index.py

@@ -11,7 +11,6 @@
 from langchain_postgres import PGEngine
 from langchain_postgres.v2.async_vectorstore import AsyncPGVectorStore
 from langchain_postgres.v2.indexes import (
-    DEFAULT_INDEX_NAME_SUFFIX,
     DistanceStrategy,
     HNSWIndex,
     IVFFlatIndex,

tests/unit_tests/v2/test_pg_vectorstore_index.py

@@ -10,7 +10,6 @@
 
 from langchain_postgres import PGEngine, PGVectorStore
 from langchain_postgres.v2.indexes import (
-    DEFAULT_INDEX_NAME_SUFFIX,
     DistanceStrategy,
     HNSWIndex,
     IVFFlatIndex,

tests/unit_tests/v2/test_pg_vectorstore_standard_suite.py

@@ -1,6 +1,6 @@
 import os
 import uuid
-from typing import AsyncIterator, Iterator
+from typing import AsyncIterator
 
 import pytest
 import pytest_asyncio