Take ty 0.0.70, bump to 2.6.4

Routine dev-tooling update ahead of the commerce-side release chain; no
runtime surface changes.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: vvillait88

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "agentscore-py"
-version = "2.6.3"
+version = "2.6.4"
 description = "Python client for the AgentScore APIs"
 readme = "README.md"
 license = "MIT"