Spring-ai Make embedding model name match its enum value

The name and enum value have a slight discrepancy for the multilingual cohere embedding model and this MR fixes it!

Comment From: bruno-oliveira

https://github.com/spring-projects/spring-ai/pull/1873

Comment From: bruno-oliveira

FYI @markpollack @tzolov :)

Comment From: bruno-oliveira

Any update on this one? :) it’s a small change, but, it’s always good to increase consistency!