Fix: Correct protocol ID for udp_v6 from IPPROTO_ICMP to IPPROTO_UDP

Author: yh3535

include/boost/cobalt/io/endpoint.hpp

@@ -116,7 +116,7 @@ constexpr static_protocol<BOOST_ASIO_OS_DEF(AF_INET),   BOOST_ASIO_OS_DEF(SOCK_S
 constexpr static_protocol<BOOST_ASIO_OS_DEF(AF_INET6),  BOOST_ASIO_OS_DEF(SOCK_STREAM), BOOST_ASIO_OS_DEF(IPPROTO_TCP)>  tcp_v6{};
 constexpr static_protocol<BOOST_ASIO_OS_DEF(AF_UNSPEC), BOOST_ASIO_OS_DEF(SOCK_DGRAM),  BOOST_ASIO_OS_DEF(IPPROTO_UDP)>  udp   {};
 constexpr static_protocol<BOOST_ASIO_OS_DEF(AF_INET),   BOOST_ASIO_OS_DEF(SOCK_DGRAM),  BOOST_ASIO_OS_DEF(IPPROTO_UDP)>  udp_v4{};
-constexpr static_protocol<BOOST_ASIO_OS_DEF(AF_INET6),  BOOST_ASIO_OS_DEF(SOCK_DGRAM),  BOOST_ASIO_OS_DEF(IPPROTO_ICMP)> udp_v6{};
+constexpr static_protocol<BOOST_ASIO_OS_DEF(AF_INET6),  BOOST_ASIO_OS_DEF(SOCK_DGRAM),  BOOST_ASIO_OS_DEF(IPPROTO_UDP)>  udp_v6{};
 constexpr static_protocol<BOOST_ASIO_OS_DEF(AF_UNSPEC), BOOST_ASIO_OS_DEF(SOCK_DGRAM),  BOOST_ASIO_OS_DEF(IPPROTO_ICMP)> icmp  {};
 constexpr static_protocol<AF_UNIX,                      BOOST_ASIO_OS_DEF(SOCK_STREAM)>    local_stream   {};
 constexpr static_protocol<AF_UNIX,                      BOOST_ASIO_OS_DEF(SOCK_DGRAM)>     local_datagram {};