community[patch]: Fix Bedrock Mistral stop sequence request key (#20115)
- **Description:** Change Bedrock's Mistral stop sequence key mapping to
"stop" rather than "stop_sequences" which is the correct key [Bedrock
docs
link](https://docs.aws.amazon.com/bedrock/latest/userguide/model-parameters-mistral.html)
`{
"prompt": string,
"max_tokens" : int,
"stop" : [string],
"temperature": float,
"top_p": float,
"top_k": int
}`
- **Issue:** #20053
- **Dependencies:** N/A
- **Twitter handle:** N/a