Bump github.com/spf13/viper from 1.8.1 to 1.9.0 (#189)

Bumps [github.com/spf13/viper](https://github.com/spf13/viper) from 1.8.1 to 1.9.0.
- [Release notes](https://github.com/spf13/viper/releases)
- [Commits](spf13/viper@v1.8.1...v1.9.0)

---
updated-dependencies:
- dependency-name: github.com/spf13/viper
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

go.mod

@@ -28,19 +28,17 @@ require (
 	github.com/prometheus/common v0.29.0 // indirect
 	github.com/prometheus/procfs v0.7.0 // indirect
 	github.com/rs/cors v1.8.0
-	github.com/smartystreets/assertions v1.2.0 // indirect
 	github.com/spf13/cobra v1.2.1
 	github.com/spf13/pflag v1.0.5
-	github.com/spf13/viper v1.8.1
+	github.com/spf13/viper v1.9.0
 	github.com/stretchr/testify v1.7.0
 	github.com/tidwall/pretty v1.2.0 // indirect
 	go.mongodb.org/mongo-driver v1.6.0 // indirect
 	go.uber.org/atomic v1.8.0 // indirect
 	go.uber.org/multierr v1.7.0 // indirect
 	go.uber.org/zap v1.19.1
-	golang.org/x/crypto v0.0.0-20210711020723-a769d52b0f97 // indirect
 	golang.org/x/net v0.0.0-20210614182718-04defd469f4e
-	google.golang.org/genproto v0.0.0-20210813162853-db860fec028c
+	google.golang.org/genproto v0.0.0-20210828152312-66f60bf46e71
 	google.golang.org/protobuf v1.27.1
 	gopkg.in/square/go-jose.v2 v2.6.0 // indirect
 	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b