credentials/alts: update handshaker.pb.go (#6857)

diff --git a/credentials/alts/internal/proto/grpc_gcp/handshaker.pb.go b/credentials/alts/internal/proto/grpc_gcp/handshaker.pb.go
index 81d0f11..00407de 100644
--- a/credentials/alts/internal/proto/grpc_gcp/handshaker.pb.go
+++ b/credentials/alts/internal/proto/grpc_gcp/handshaker.pb.go
@@ -613,6 +613,10 @@
 	// that the peer's out_frames are split into multiple NextHandshakerMessageReq
 	// messages.
 	InBytes []byte `protobuf:"bytes,1,opt,name=in_bytes,json=inBytes,proto3" json:"in_bytes,omitempty"`
+	// Number of milliseconds between when the application send the last handshake
+	// message to the peer and when the application received the current handshake
+	// message (in the in_bytes field) from the peer.
+	NetworkLatencyMs uint32 `protobuf:"varint,2,opt,name=network_latency_ms,json=networkLatencyMs,proto3" json:"network_latency_ms,omitempty"`
 }
 
 func (x *NextHandshakeMessageReq) Reset() {
@@ -654,6 +658,13 @@
 	return nil
 }
 
+func (x *NextHandshakeMessageReq) GetNetworkLatencyMs() uint32 {
+	if x != nil {
+		return x.NetworkLatencyMs
+	}
+	return 0
+}
+
 type HandshakerReq struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
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 var (