feat!: change default version to v1beta1 (#36)

* feat!: change default version to v1beta1

Release-As: v0.4.0

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: alexander-fenster

.repo-metadata.json

@@ -9,6 +9,6 @@
 	"repo": "googleapis/nodejs-dataform",
 	"distribution_name": "@google-cloud/dataform",
 	"api_id": "dataform.googleapis.com",
-	"default_version": "v1alpha2",
+	"default_version": "v1beta1",
 	"requires_billing": true
-  }
+  }

src/index.ts

@@ -19,8 +19,8 @@
 import * as v1alpha2 from './v1alpha2';
 import * as v1beta1 from './v1beta1';
 
-const DataformClient = v1alpha2.DataformClient;
-type DataformClient = v1alpha2.DataformClient;
+const DataformClient = v1beta1.DataformClient;
+type DataformClient = v1beta1.DataformClient;
 
 export {v1alpha2, v1beta1, DataformClient};
 export default {v1alpha2, v1beta1, DataformClient};