fix(deps): update module github.com/spf13/viper to v1.9.0 (#523)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

go.mod

@@ -10,7 +10,7 @@ require (
 	github.com/pkg/errors v0.9.1
 	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
 	golang.org/x/term v0.0.0-20210916214954-140adaaadfaf
 )