fix: Remove unused pytest import to resolve lint check

- Remove unused pytest import from test_bedrock_authentication.py
- Fixes F401 lint error that was causing CI failure

Co-Authored-By: Jo\u00E3o <joao@crewai.com>

tests/test_bedrock_authentication.py

@@ -1,5 +1,4 @@
 import os
-import pytest
 from unittest.mock import patch, MagicMock
 from crewai import LLM