Add support for Bedrock access using AWS_BEARER_TOKEN_BEDROCK

[akshayar]

AWS Bedrock can be accessed using API key now.
Refer
https://aws.amazon.com/about-aws/whats-new/2025/07/amazon-bedrock-api-keys-for-streamlined-development/
and
https://aws.amazon.com/blogs/machine-learning/accelerate-ai-development-with-amazon-bedrock-api-keys/

This feature got released in https://github.com/aws/aws-sdk-java-v2/blob/master/changelogs/2.31.x-CHANGELOG.md [2.31.74 2025-06-30]
Amazon Bedrock
Features

Add support for API Keys, Re-Ranker, implicit filter for RAG / KB evaluation for Bedrock APIs.

Add support for this. The API needs to be bumped to 2.31.74.
Please update.