[renovate] Update module github.com/grpc-ecosystem/grpc-gateway/v2 to v2.21.0

This MR contains the following updates:

Package	Type	Update	Change
github.com/grpc-ecosystem/grpc-gateway/v2	require	minor	v2.20.0 -> v2.21.0

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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 v2.20.0
+	github.com/grpc-ecosystem/grpc-gateway/v2 v2.21.0
 	github.com/hashicorp/go-multierror v1.1.1
 	github.com/openconfig/gnmi v0.11.0
 	github.com/openconfig/goyang v1.6.0
@@ -17,7 +17,7 @@ require (
 	github.com/sirupsen/logrus v1.9.3
 	github.com/stretchr/testify v1.9.0
 	golang.org/x/sys v0.22.0
-	google.golang.org/genproto/googleapis/api v0.0.0-20240722135656-d784300faade
+	google.golang.org/genproto/googleapis/api v0.0.0-20240723171418-e6d459c13d2a
 	google.golang.org/grpc v1.65.0
 	google.golang.org/protobuf v1.34.2
 	gopkg.in/yaml.v3 v3.0.1
@@ -39,5 +39,5 @@ require (
 	golang.org/x/exp v0.0.0-20240222234643-814bf88cf225 // indirect
 	golang.org/x/net v0.26.0 // indirect
 	golang.org/x/text v0.16.0 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20240701130421-f6361c86f094 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20240723171418-e6d459c13d2a // indirect
 )