fix(deps): update module github.com/prometheus/client_golang to v1.16.0

Author: renovate[bot]

go.mod

@@ -9,9 +9,9 @@ require (
 	github.com/knadh/koanf v1.3.3
 	github.com/oklog/run v1.1.0
 	github.com/pkg/errors v0.9.1
-	github.com/prometheus/client_golang v1.11.0
+	github.com/prometheus/client_golang v1.16.0
 	github.com/spf13/cobra v1.2.1
-	github.com/stretchr/testify v1.7.0
+	github.com/stretchr/testify v1.8.0
 	go.uber.org/dig v1.13.0
-	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
+	golang.org/x/sync v0.2.0
 )