fix wrong version

Author: sarinali

libs/python/agent/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "pdm.backend"
 
 [project]
 name = "cua-agent"
-version = "0.5.1"
+version = "0.5.0"
 description = "CUA (Computer Use) Agent for AI-driven computer interaction"
 readme = "README.md"
 authors = [