chore(deps): update dependency google-cloud-asset to v2 (#69)

Author: renovate-bot

asset/snippets/snippets/requirements.txt

@@ -1,5 +1,5 @@
 google-cloud-storage==1.29.0
-google-cloud-asset==1.3.0
+google-cloud-asset==2.0.0
 google-cloud-resource-manager==0.30.2
 google-cloud-pubsub==1.7.0
 google-cloud-bigquery==1.25.0