[renovate] Update module github.com/prometheus/client_golang to v1.20.3

This MR contains the following updates:

Package	Type	Update	Change
github.com/prometheus/client_golang	require	patch	v1.20.2 -> v1.20.3

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go.mod

@@ -13,7 +13,7 @@ require (
 	github.com/openconfig/gnmi v0.11.0
 	github.com/openconfig/goyang v1.6.0
 	github.com/openconfig/ygot v0.29.20
-	github.com/prometheus/client_golang v1.20.2
+	github.com/prometheus/client_golang v1.20.3
 	github.com/pterm/pterm v0.12.79
 	github.com/sethvargo/go-password v0.3.1
 	github.com/sirupsen/logrus v1.9.3