Update claude extension

[gcordalis]

Description

Added the new Claude 3.5 Sonnet model as an option and their 'latest' 3.5-sonnet model which will default automatically to the latest; hopefully means we don't need extension updates for each new 3.5-sonnet model release going forward.

Screencast

Checklist

• [x] I read the extension guidelines
• [x] I read the documentation about publishing
• [x] I ran npm run build and tested this distribution build in Raycast
• [x] I checked that files in the assets folder are used by the extension itself
• [x] I checked that assets used by the README are placed outside of the metadata folder