Update Go modules

Update all modules to the latest versions. This starts to reduce the
indirect dependencies on go-kit/kit in favor of go-kit/log.

Signed-off-by: SuperQ <superq@gmail.com>

go.mod

@@ -3,12 +3,13 @@ module github.com/prometheus/client_golang
 require (
 	github.com/beorn7/perks v1.0.1
 	github.com/cespare/xxhash/v2 v2.1.1
-	github.com/golang/protobuf v1.4.3
-	github.com/json-iterator/go v1.1.10
+	github.com/golang/protobuf v1.5.2
+	github.com/json-iterator/go v1.1.11
 	github.com/prometheus/client_model v0.2.0
-	github.com/prometheus/common v0.18.0
+	github.com/prometheus/common v0.26.0
 	github.com/prometheus/procfs v0.6.0
-	golang.org/x/sys v0.0.0-20210309074719-68d13333faf2
+	golang.org/x/sys v0.0.0-20210603081109-ebe580a85c40
+	golang.org/x/text v0.3.2 // indirect
 )
 
 go 1.13