Feature/qnabot6.1.1

[rstrahan]

Issue #, if available: N/A

Description of changes: Update nested QnABot to use latest version 6.1.1 which enables

• configurable CloudWatch log retention
• built in support for Bedrock embeddings models (no more need for QnABot plugins)
• improved UI for QnABot settings
• misc bug fixes and improvements

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