chore(deps): update dependency google-cloud-asset to v0.8.0 (#3063)

Author: renovate-bot

asset/cloud-client/requirements.txt

@@ -1,4 +1,4 @@
 google-cloud-storage==1.26.0
-google-cloud-asset==0.7.0
+google-cloud-asset==0.8.0
 google-cloud-resource-manager==0.30.0
 google-cloud-pubsub==1.1.0