Remove invalid claude-3-7-sonnet-latest model entry

Anthropic's API does not accept claude-3-7-sonnet-latest as a model ID
(returns 404). The versioned alias claude-3-7-sonnet-20250219 should be
used instead.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: NIKU-SINGH