ProcessPingAck no longer return bool

src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/Http2Connection.cs

@@ -1895,15 +1895,14 @@ private void RefreshPingTimestamp()
             _nextPingRequestTimestamp = Environment.TickCount64 + (long)_keepAlivePingDelay.TotalMilliseconds;
         }
 
-        private bool ProcessPingAck(long payload)
+        private void ProcessPingAck(long payload)
         {
             if (_keepAliveState != KeepAliveState.PingSent)
                 ThrowProtocolError();
             if (Interlocked.Read(ref _keepAlivePingPayload) != payload)
                 ThrowProtocolError();
             _keepAliveState = KeepAliveState.None;
             RefreshPingTimestamp();
-            return true;
         }
 
         private void VerifyKeepAlive()