Update module github.com/prometheus/client_golang to v1.15.0

go.mod

@@ -6,23 +6,25 @@ require (
 	github.com/gorilla/mux v1.7.3
 	github.com/gorilla/websocket v1.4.0
 	github.com/pkg/errors v0.9.1
-	github.com/prometheus/client_golang v1.11.1
+	github.com/prometheus/client_golang v1.15.0
 	github.com/sirupsen/logrus v1.6.0
-	github.com/stretchr/testify v1.4.0
+	github.com/stretchr/testify v1.8.0
 )
 
 require (
 	github.com/beorn7/perks v1.0.1 // indirect
-	github.com/cespare/xxhash/v2 v2.1.1 // indirect
+	github.com/cespare/xxhash/v2 v2.2.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/golang/protobuf v1.4.3 // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
 	github.com/konsorten/go-windows-terminal-sequences v1.0.3 // indirect
-	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
+	github.com/kr/text v0.2.0 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/prometheus/client_model v0.2.0 // indirect
-	github.com/prometheus/common v0.26.0 // indirect
-	github.com/prometheus/procfs v0.6.0 // indirect
-	golang.org/x/sys v0.0.0-20210603081109-ebe580a85c40 // indirect
-	google.golang.org/protobuf v1.26.0-rc.1 // indirect
-	gopkg.in/yaml.v2 v2.3.0 // indirect
+	github.com/prometheus/client_model v0.3.0 // indirect
+	github.com/prometheus/common v0.42.0 // indirect
+	github.com/prometheus/procfs v0.9.0 // indirect
+	github.com/rogpeppe/go-internal v1.10.0 // indirect
+	golang.org/x/sys v0.6.0 // indirect
+	google.golang.org/protobuf v1.30.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )