community[patch]: Fix pydantic ForwardRef error in BedrockBase (#17416)

- **Description:** Fixes a type annotation issue in the definition of
BedrockBase. This issue was that the annotation for the `config`
attribute includes a ForwardRef to `botocore.client.Config` which is
only imported when `TYPE_CHECKING`. This can cause pydantic to raise an
error like `pydantic.errors.ConfigError: field "config" not yet prepared
so type is still a ForwardRef, ...`.
  - **Issue:** N/A
  - **Dependencies:** N/A
  - **Twitter handle:** `@__nat_n__`

libs/community/langchain_community/llms/bedrock.py

@@ -1,11 +1,8 @@
-from __future__ import annotations
-
 import asyncio
 import json
 import warnings
 from abc import ABC
 from typing import (
-    TYPE_CHECKING,
     Any,
     AsyncGenerator,
     AsyncIterator,
@@ -31,9 +28,6 @@ from langchain_community.utilities.anthropic import (
     get_token_ids_anthropic,
 )
 
-if TYPE_CHECKING:
-    from botocore.config import Config
-
 AMAZON_BEDROCK_TRACE_KEY = "amazon-bedrock-trace"
 GUARDRAILS_BODY_KEY = "amazon-bedrock-guardrailAssessment"
 HUMAN_PROMPT = "\n\nHuman:"
@@ -226,7 +220,7 @@ class BedrockBase(BaseModel, ABC):
     See: https://boto3.amazonaws.com/v1/documentation/api/latest/guide/credentials.html
     """
 
-    config: Optional[Config] = None
+    config: Any = None
     """An optional botocore.config.Config instance to pass to the client."""
 
     provider: Optional[str] = None