build(deps): bump cloud.google.com/go/storage from 1.16.1 to 1.18.1

Bumps [cloud.google.com/go/storage](https://github.com/googleapis/google-cloud-go) from 1.16.1 to 1.18.1.
- [Release notes](https://github.com/googleapis/google-cloud-go/releases)
- [Changelog](https://github.com/googleapis/google-cloud-go/blob/master/CHANGES.md)
- [Commits](https://github.com/googleapis/google-cloud-go/compare/storage/v1.16.1...storage/v1.18.1)

---
updated-dependencies:
- dependency-name: cloud.google.com/go/storage
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

vendor/cloud.google.com/go/go.mod

@@ -10,8 +10,9 @@ require (
 	github.com/googleapis/gax-go/v2 v2.1.0
 	go.opencensus.io v0.23.0
 	golang.org/x/oauth2 v0.0.0-20210819190943-2bc19b11175f
-	google.golang.org/api v0.55.0
-	google.golang.org/genproto v0.0.0-20210831024726-fe130286e0e2
+	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1
+	google.golang.org/api v0.57.0
+	google.golang.org/genproto v0.0.0-20210924002016-3dee208752a0
 	google.golang.org/grpc v1.40.0
 	google.golang.org/protobuf v1.27.1
 )