[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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controller/nucleus/networkElementWatcher.go

@@ -247,11 +247,11 @@ func (n *NetworkElementWatcher) handleSubscribeResponseUpdate(resp *gpb.Subscrib
 
 		switch v := update.GetVal().GetValue().(type) {
 		case *gpb.TypedValue_StringVal:
-			pathsAndValues[pathString] = update.Val.GetStringVal()
+			pathsAndValues[pathString] = update.GetVal().GetStringVal()
 		case *gpb.TypedValue_JsonIetfVal:
 			pathsAndValues[pathString] = string(update.GetVal().GetJsonIetfVal())
 		case *gpb.TypedValue_UintVal:
-			pathsAndValues[pathString] = fmt.Sprintf("%d", update.Val.GetUintVal())
+			pathsAndValues[pathString] = fmt.Sprintf("%d", update.GetVal().GetUintVal())
 		default:
 			log.Errorf("The given value of type: %T, provided by a SubResponse from network element with ID: %s is not supported", v, subscriptionInfo.NetworkElementID)
 			return