Can send .jpeg but not .jpg files to Anthropic

Baml sets `media_type` to `image/jpg` for `.jpg` files, which causes Antropic to fail: `Input should be 'image/jpeg', 'image/png', 'image/gif' or 'image/webp'`. Changing the extension to `.jpeg` fixes this, but I think Baml should patch this problem by sending `image/jpeg` when the filename ends in `.jpg`.