style: clear the ruff reds lts/1.108.x already has

Sorts two imports ruff flags (I001) in redis_update_buffer.py and utils.py, the same hunks #50348 carries, and drops a duplicate GenericStreamingChunk import (F811) in a streaming test. No behavior change.

litellm/proxy/db/db_transaction_queue/redis_update_buffer.py

@@ -13,7 +13,6 @@ from itertools import chain
 from typing import TYPE_CHECKING, Any, Final, Literal, TypeAlias, TypeVar, cast
 
 from pydantic import TypeAdapter
-
 from redis.exceptions import RedisError
 
 from litellm._internal_context import with_service_target

litellm/utils.py

@@ -434,11 +434,11 @@ if TYPE_CHECKING:
     )
     from litellm.llms.cohere.common_utils import CohereModelInfo
     from litellm.llms.custom_httpx.http_handler import AsyncHTTPHandler, HTTPHandler
+    from litellm.llms.custom_llm import CustomLLM
     from litellm.router_utils.get_retry_from_policy import (
         get_num_retries_from_retry_policy,
         reset_retry_policy,
     )
-    from litellm.llms.custom_llm import CustomLLM
     from litellm.types.llms.anthropic import (
         ANTHROPIC_API_ONLY_HEADERS,
         AnthropicThinkingParam,

tests/unit/litellm_core_utils/test_streaming_chunk_builder_utils.py

@@ -18,7 +18,6 @@ from litellm.types.utils import (
     ChatCompletionMessageToolCall,
     Delta,
     Function,
-    GenericStreamingChunk,
     ModelResponseStream,
     PromptTokensDetails,
     ServerToolUse,