chore: upgrade dependencies to latest versions

Notable updates: google-cloud-aiplatform 1.139.0, google-genai 1.64.0,
typer 0.24.1, a2a-sdk 0.3.24, cryptography 46.0.5.

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

Author: mmontan