chore: deps(go): bump module github.com/spf13/viper to v1.21.0

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Author: updatecli

go.mod

@@ -11,7 +11,7 @@ require (
 	github.com/jackc/pgx/v5 v5.7.6
 	github.com/sirupsen/logrus v1.9.3
 	github.com/spf13/cobra v1.9.1
-	github.com/spf13/viper v1.20.1
+	github.com/spf13/viper v1.21.0
 	github.com/stephenafamo/bob v0.40.2
 	github.com/stretchr/testify v1.11.1
 	github.com/swaggo/files v1.0.1