chore(config): remove co-authors section, normalize vergil dep to v2.0 (#500)

Co-authored-by: wphillipmoore-vergil <285019742+wphillipmoore-vergil@users.noreply.github.com>

Author: wphillipmoore

vergil.toml

@@ -5,9 +5,6 @@ branching-model = "library-release"
 release-model = "artifact-publishing"
 primary-language = "python"
 
-[project.co-authors]
-agent = "Co-Authored-By: wphillipmoore-agent <284101533+wphillipmoore-agent@users.noreply.github.com>"
-
 [ci]
 versions = ["3.12", "3.13", "3.14"]
 integration-tests = true