[renovate] Update module github.com/grpc-ecosystem/grpc-gateway/v2 to v2.26.3

go.mod

@@ -7,7 +7,7 @@ require (
 	code.fbi.h-da.de/danet/quipsec/gen/go/quipsec v0.0.0-20231207135002-06d40645e073
 	github.com/google/uuid v1.6.0
 	github.com/gorilla/mux v1.8.1
-	github.com/grpc-ecosystem/grpc-gateway/v2 v2.24.0
+	github.com/grpc-ecosystem/grpc-gateway/v2 v2.26.3
 	github.com/hashicorp/go-multierror v1.1.1
 	github.com/openconfig/gnmi v0.11.0
 	github.com/openconfig/goyang v1.6.0