[renovate] Update module github.com/openconfig/gnmi to v0.13.0

This MR contains the following updates:

Package	Type	Update	Change
github.com/openconfig/gnmi	require	minor	v0.12.0 -> v0.13.0

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go.mod

 module code.fbi.h-da.de/danet/gosdn
 
-go 1.23
+go 1.23.4
+
+toolchain go1.23.6
 
 require (
 	github.com/aristanetworks/goarista v0.0.0-20250108234106-1f88a86e2265
@@ -10,7 +12,7 @@ require (
 	github.com/google/uuid v1.6.0
 	github.com/grpc-ecosystem/grpc-gateway/v2 v2.26.0
 	github.com/mitchellh/go-homedir v1.1.0
-	github.com/openconfig/gnmi v0.12.0
+	github.com/openconfig/gnmi v0.13.0
 	github.com/openconfig/goyang v1.6.0
 	github.com/openconfig/ygot v0.29.20
 	github.com/prometheus/client_golang v1.20.5