fix: Fixed a missing RuntimeAccessModifiers change for universal RPC attribute (#2783)

Author: ShadauxCat

com.unity.netcode.gameobjects/Editor/CodeGen/RuntimeAccessModifiersILPP.cs

@@ -164,6 +164,8 @@ private void ProcessNetworkBehaviour(TypeDefinition typeDefinition)
                     methodDefinition.Name == nameof(NetworkBehaviour.__endSendServerRpc) ||
                     methodDefinition.Name == nameof(NetworkBehaviour.__beginSendClientRpc) ||
                     methodDefinition.Name == nameof(NetworkBehaviour.__endSendClientRpc) ||
+                    methodDefinition.Name == nameof(NetworkBehaviour.__beginSendRpc) ||
+                    methodDefinition.Name == nameof(NetworkBehaviour.__endSendRpc) ||
                     methodDefinition.Name == nameof(NetworkBehaviour.__initializeVariables) ||
                     methodDefinition.Name == nameof(NetworkBehaviour.__initializeRpcs) ||
                     methodDefinition.Name == nameof(NetworkBehaviour.__registerRpc) ||