Fix CI: drop unused netip import and regenerate proto with original protoc

relay/test/benchmark_test.go

@@ -5,7 +5,6 @@ import (
 	"crypto/rand"
 	"fmt"
 	"net"
-	"net/netip"
 	"os"
 	"sync"
 	"testing"

shared/relay/client/manager_serverip_test.go

@@ -2,6 +2,7 @@ package client
 
 import (
 	"context"
+	"io"
 	"net/netip"
 	"testing"
 	"time"
@@ -124,7 +125,7 @@ func TestManager_ForeignRelayServerIP(t *testing.T) {
 		}
 
 		buf := make([]byte, len(payload))
-		if _, err := aliceConn.Read(buf); err != nil {
+		if _, err := io.ReadFull(aliceConn, buf); err != nil {
 			t.Fatalf("alice read echo: %s", err)
 		}
 		if string(buf) != string(payload) {

shared/signal/proto/signalexchange.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.26.0
-// 	protoc        v7.34.1
+// 	protoc        v3.21.12
 // source: signalexchange.proto
 
 package proto