update aws-sdk to support new region

vendor/github.com/aws/aws-sdk-go/private/protocol/ec2query/build.go

@@ -24,7 +24,7 @@ func Build(r *request.Request) {
 		r.Error = awserr.New("SerializationError", "failed encoding EC2 Query request", err)
 	}
 
-	if r.ExpireTime == 0 {
+	if !r.IsPresigned() {
 		r.HTTPRequest.Method = "POST"
 		r.HTTPRequest.Header.Set("Content-Type", "application/x-www-form-urlencoded; charset=utf-8")
 		r.SetBufferBody([]byte(body.Encode()))