fix(deps): bump github.com/spf13/viper from 1.8.1 to 1.9.0

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>

go.mod

@@ -11,14 +11,14 @@ require (
 	github.com/manifoldco/promptui v0.8.0
 	github.com/pkg/errors v0.9.1
 	github.com/spf13/cobra v1.2.1
-	github.com/spf13/viper v1.8.1
+	github.com/spf13/viper v1.9.0
 	golang.org/x/crypto v0.0.0-20210817164053-32db794688a5
 	gopkg.in/yaml.v2 v2.4.0
 )
 
 require (
 	github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e // indirect
-	github.com/fsnotify/fsnotify v1.4.9 // indirect
+	github.com/fsnotify/fsnotify v1.5.1 // indirect
 	github.com/getkin/kin-openapi v0.28.0 // indirect
 	github.com/ghodss/yaml v1.0.0 // indirect
 	github.com/golang/protobuf v1.5.2 // indirect
@@ -28,20 +28,20 @@ require (
 	github.com/juju/ansiterm v0.0.0-20180109212912-720a0952cc2a // indirect
 	github.com/lunixbochs/vtclean v0.0.0-20180621232353-2d01aacdc34a // indirect
 	github.com/magiconair/properties v1.8.5 // indirect
-	github.com/mattn/go-colorable v0.0.9 // indirect
-	github.com/mattn/go-isatty v0.0.4 // indirect
-	github.com/mitchellh/mapstructure v1.4.1 // indirect
-	github.com/pelletier/go-toml v1.9.3 // indirect
+	github.com/mattn/go-colorable v0.1.6 // indirect
+	github.com/mattn/go-isatty v0.0.12 // indirect
+	github.com/mitchellh/mapstructure v1.4.2 // indirect
+	github.com/pelletier/go-toml v1.9.4 // indirect
 	github.com/spf13/afero v1.6.0 // indirect
-	github.com/spf13/cast v1.3.1 // indirect
+	github.com/spf13/cast v1.4.1 // indirect
 	github.com/spf13/jwalterweatherman v1.1.0 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
 	github.com/subosito/gotenv v1.2.0 // indirect
-	golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4 // indirect
-	golang.org/x/oauth2 v0.0.0-20210402161424-2e8d93401602 // indirect
-	golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1 // indirect
-	golang.org/x/text v0.3.5 // indirect
+	golang.org/x/net v0.0.0-20210503060351-7fd8e65b6420 // indirect
+	golang.org/x/oauth2 v0.0.0-20210819190943-2bc19b11175f // indirect
+	golang.org/x/sys v0.0.0-20210823070655-63515b42dcdf // indirect
+	golang.org/x/text v0.3.6 // indirect
 	google.golang.org/appengine v1.6.7 // indirect
-	google.golang.org/protobuf v1.26.0 // indirect
-	gopkg.in/ini.v1 v1.62.0 // indirect
+	google.golang.org/protobuf v1.27.1 // indirect
+	gopkg.in/ini.v1 v1.63.2 // indirect
 )