Bump google.golang.org/api from 0.20.0 to 0.21.0 (#373)

Bumps [google.golang.org/api](https://github.com/google/google-api-go-client) from 0.20.0 to 0.21.0.
- [Release notes](https://github.com/google/google-api-go-client/releases)
- [Changelog](https://github.com/googleapis/google-api-go-client/blob/master/CHANGES.md)
- [Commits](https://github.com/google/google-api-go-client/compare/v0.20.0...v0.21.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

go.mod

@@ -25,7 +25,7 @@ require (
 	golang.org/x/net v0.0.0-20200222125558-5a598a2470a0
 	golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e
 	golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae
-	google.golang.org/api v0.20.0
+	google.golang.org/api v0.21.0
 )
 
 replace git.apache.org/thrift.git => github.com/apache/thrift v0.0.0-20180902110319-2566ecd5d999

go.sum

@@ -492,6 +492,8 @@ google.golang.org/api v0.18.0 h1:TgDr+1inK2XVUKZx3BYAqQg/GwucGdBkzZjWaTg/I+A=
 google.golang.org/api v0.18.0/go.mod h1:BwFmGc8tA3vsd7r/7kR8DY7iEEGSU04BFxCo5jP/sfE=
 google.golang.org/api v0.20.0 h1:jz2KixHX7EcCPiQrySzPdnYT7DbINAypCqKZ1Z7GM40=
 google.golang.org/api v0.20.0/go.mod h1:BwFmGc8tA3vsd7r/7kR8DY7iEEGSU04BFxCo5jP/sfE=
+google.golang.org/api v0.21.0 h1:zS+Q/CJJnVlXpXQVIz+lH0ZT2lBuT2ac7XD8Y/3w6hY=
+google.golang.org/api v0.21.0/go.mod h1:BwFmGc8tA3vsd7r/7kR8DY7iEEGSU04BFxCo5jP/sfE=
 google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
 google.golang.org/appengine v1.4.0 h1:/wp5JvzpHIxhs/dumFmF7BXTf3Z+dd4uXta4kVyO508=
 google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=