fix(gen-dart): update Dart pubspec to remove publish_to

Author: zguydev

gen/dart/templates/common/pubspec.yaml.tmpl

@@ -1,7 +1,6 @@
 {{- /* Template pubspec.yaml for generated Dart SDKs. */ -}}
 name: {{ .PackageName }}
 version: {{ printf "%q" .PackageVersion }} {{- /* The real version is set on release. */}}
-publish_to: none
 description: {{ .PackageDescription }} (based on {{ .SpecRef }})
 homepage: https://github.com/cu-devs-collective/open-cu-services-sdk
 repository: https://github.com/cu-devs-collective/open-cu-services-sdk