Update module github.com/grpc-ecosystem/grpc-gateway to v2

Author: renovate[bot]

go.mod

@@ -188,7 +188,7 @@ replace (
 	github.com/go-check/check => github.com/go-check/check v0.0.0-20180628173108-788fd7840127
 
 	github.com/golang/protobuf => github.com/golang/protobuf v1.4.2
-	github.com/grpc-ecosystem/grpc-gateway => github.com/grpc-ecosystem/grpc-gateway v1.16.0
+	github.com/grpc-ecosystem/grpc-gateway/v2 => github.com/grpc-ecosystem/grpc-gateway v2.15.2
 	github.com/improbable-eng/grpc-web => github.com/improbable-eng/grpc-web v0.0.0-20181111100011-16092bd1d58a
 
 	// Avoid CVE-2022-3064