fix(deps): update module github.com/spf13/viper to v1.15.0

Author: renovate[bot]

go.mod

@@ -17,7 +17,7 @@ require (
 	github.com/pkg/xattr v0.4.9
 	github.com/sirupsen/logrus v1.9.0
 	github.com/spf13/cobra v1.6.1
-	github.com/spf13/viper v1.14.0
+	github.com/spf13/viper v1.15.0
 	github.com/stretchr/testify v1.8.2
 	golang.org/x/crypto v0.7.0
 	golang.org/x/sync v0.1.0