Update module github.com/prometheus/client_golang to v0.12.1

go.mod

@@ -1,12 +1,14 @@
 module github.com/ccjenniferhsu/logstash_exporter
 
 require (
-	github.com/prometheus/client_golang v0.9.2
-	github.com/prometheus/client_model v0.0.0-20190129233127-fd36f4220a90 // indirect
-	github.com/prometheus/common v0.2.0
-	github.com/prometheus/procfs v0.0.0-20190209105433-f8d8b3f739bd // indirect
-	github.com/stretchr/testify v1.3.0
-	golang.org/x/sync v0.0.0-20190423024810-112230192c58 // indirect
+	github.com/cespare/xxhash/v2 v2.1.2 // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/prometheus/client_golang v1.11.0
+	github.com/prometheus/common v0.32.1
+	github.com/prometheus/procfs v0.7.3 // indirect
+	github.com/stretchr/testify v1.4.0
+	golang.org/x/sys v0.0.0-20220114195835-da31bd327af9 // indirect
 	gopkg.in/alecthomas/kingpin.v2 v2.2.6
 )