Release bigquery 1.6.0 (googleapis#6148)

Release storage-1.13.0 (googleapis#6139)

Release api_core 1.4.1 (googleapis#6133)

Release 0.8.0 (googleapis#6106)

Release 1.5.1 (googleapis#6054)

Release videointelligence 1.4.0 (googleapis#6027)

Release kms-0.2.0 (googleapis#6034)

Tag bigtable-0.30.2 release.

Tag asset-0.1.0 release

Release redis 0.2.0 (googleapis#5989)