Bump github.com/spf13/viper from 1.7.1 to 1.8.0 (#483)

Bumps [github.com/spf13/viper](https://github.com/spf13/viper) from 1.7.1 to 1.8.0.
- [Release notes](https://github.com/spf13/viper/releases)
- [Commits](spf13/viper@v1.7.1...v1.8.0)

---
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

@@ -39,19 +39,15 @@ require (
 	github.com/prometheus/client_golang v1.11.0
 	github.com/rogpeppe/go-internal v1.5.0 // indirect
 	github.com/sirupsen/logrus v1.8.1
-	github.com/spf13/afero v1.2.0 // indirect
 	github.com/spf13/cobra v1.1.3
-	github.com/spf13/viper v1.7.1
+	github.com/spf13/viper v1.8.0
 	github.com/stretchr/objx v0.2.0 // indirect
 	github.com/stretchr/testify v1.7.0
 	github.com/uber/jaeger-client-go v2.29.1+incompatible
 	github.com/uber/jaeger-lib v2.2.0+incompatible // indirect
 	github.com/urfave/negroni v1.0.0 // indirect
 	github.com/xo/dburl v0.0.0-20200124232849-e9ec94f52bc3
-	go.uber.org/atomic v1.6.0 // indirect
-	golang.org/x/lint v0.0.0-20200302205851-738671d3881b // indirect
-	golang.org/x/sync v0.0.0-20201207232520-09787c993a3a
-	google.golang.org/genproto v0.0.0-20201002142447-3860012362da // indirect
+	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
 	google.golang.org/grpc v1.38.0
 	google.golang.org/protobuf v1.26.0
 	gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f // indirect