Spring-ai Ensure matching enum id to value for multilingual cohere embedding model

This ensures that the enum name matches the actual value from Bedrock as a provider.

Comment From: bruno-oliveira

FYI @tzolov @markpollack :)

Comment From: markpollack

tx, sorry it took a while. merged in 2aaa57fc7abf097d40dc2bedb5c0242620615b03