[renovate] Update module github.com/prometheus/client_golang to v1.21.0

This MR contains the following updates:

Package	Type	Update	Change
github.com/prometheus/client_golang	require	minor	v1.20.5 -> v1.21.0

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go.mod

@@ -15,7 +15,7 @@ require (
 	github.com/openconfig/gnmi v0.14.0
 	github.com/openconfig/goyang v1.6.2
 	github.com/openconfig/ygot v0.29.21
-	github.com/prometheus/client_golang v1.20.5
+	github.com/prometheus/client_golang v1.21.0
 	github.com/pterm/pterm v0.12.80
 	github.com/sethvargo/go-password v0.3.1
 	github.com/sirupsen/logrus v1.9.3
@@ -66,7 +66,7 @@ require (
 	github.com/pkg/term v1.2.0-beta.2 // indirect
 	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
 	github.com/prometheus/client_model v0.6.1 // indirect
-	github.com/prometheus/common v0.61.0 // indirect
+	github.com/prometheus/common v0.62.0 // indirect
 	github.com/prometheus/procfs v0.15.1 // indirect
 	github.com/rabbitmq/amqp091-go v1.10.0
 	github.com/rivo/uniseg v0.4.4 // indirect