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>

go.mod

@@ -3,9 +3,8 @@ module github.com/osbuild/osbuild-composer
 go 1.15
 
 require (
-	cloud.google.com/go v0.94.1 // indirect
 	cloud.google.com/go/cloudbuild v0.2.0
-	cloud.google.com/go/storage v1.16.1
+	cloud.google.com/go/storage v1.18.1
 	github.com/Azure/azure-pipeline-go v0.2.3
 	github.com/Azure/azure-sdk-for-go v57.4.0+incompatible
 	github.com/Azure/azure-storage-blob-go v0.14.0
@@ -46,10 +45,10 @@ require (
 	github.com/ubccr/kerby v0.0.0-20170626144437-201a958fc453
 	github.com/vmware/govmomi v0.26.1
 	golang.org/x/mod v0.5.0 // indirect
-	golang.org/x/oauth2 v0.0.0-20210819190943-2bc19b11175f
-	golang.org/x/sys v0.0.0-20210910150752-751e447fb3d0
-	google.golang.org/api v0.56.0
-	google.golang.org/genproto v0.0.0-20210903162649-d08c68adba83
+	golang.org/x/oauth2 v0.0.0-20211005180243-6b3c2da341f1
+	golang.org/x/sys v0.0.0-20210917161153-d61c044b1678
+	google.golang.org/api v0.58.0
+	google.golang.org/genproto v0.0.0-20210924002016-3dee208752a0
 	google.golang.org/protobuf v1.27.1
 	gopkg.in/ini.v1 v1.63.0
 	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect