upgrade asio from 1.29.0 to 1.38.0 (#827)

Migrate removed deprecated APIs:
- io_service -> io_context
- io_service::work -> executor_work_guard
- resolver::query/iterator -> resolver::resolve() with results_type
- address::from_string() -> make_address()

---

Breaking Changes (1.33.0)
  - deferred as default completion token — can omit token in coroutines: co_await socket.async_read_some(buf)
  - cancel_after / cancel_at — timeout any async operation: co_await sock.async_read_some(buf, cancel_after(5s))
  - Partial completion token adapters — as_tuple, redirect_error, bind_executor etc. composable via pipe: co_await (async_write(sock, buf) | as_tuple | cancel_after(10s))
  - composed — simpler alternative to async_compose for stateful operation implementations
  - co_composed moved out of experimental

  1.35.0 — Allocator & Resolver
  - Allocator constructors for io_context and thread_pool — control memory allocation for services, I/O objects, strands
  - Configurable resolver thread pool ("resolver"/"threads")
  - Timer heap pre-allocation ("timer"/"heap_reserve")

  1.37.0 — Inline Executors & Reactor Tuning
  - inline_executor — always executes inline (useful as completion executor)
  - inline_or_executor<> — tries inline first, falls back to wrapped executor
  - New dispatch/post/defer overloads that run a function on one executor and deliver result to a handler on another
  - redirect_disposition — captures disposition into a variable (like redirect_error but generic)
  - Reactor config: reset_edge_on_partial_read, use_eventfd, use_timerfd

  Notable Fixes

  - Resource leak in awaitable move assignment (1.37.0)
  - Memory leak in SSL stream move assignment (1.37.0)
  - Thread sanitizer issue in kqueue reactor (1.37.0)
  - co_spawn non-reentrant completion handler fix (1.36.0)
  - Windows file append mode fix (1.32.0)
  - SSL engine move assignment leak (1.33.0)

1 files changed, 2 insertions, 2 deletions

diff --git a/src/zenhttp/servers/httpsys.cpp b/src/zenhttp/servers/httpsys.cpp
index 83b98013e..4d6a53696 100644
--- a/src/zenhttp/servers/httpsys.cpp
+++ b/src/zenhttp/servers/httpsys.cpp
@@ -2758,9 +2758,9 @@ HttpSysServer::OnGetExternalHost() const
 	// causes the OS to select the appropriate local interface without sending any data.
 	try
 	{
-		asio::io_service	  IoService;
+		asio::io_context	  IoService;
 		asio::ip::udp::socket Sock(IoService, asio::ip::udp::v4());
-		Sock.connect(asio::ip::udp::endpoint(asio::ip::address::from_string("8.8.8.8"), 80));
+		Sock.connect(asio::ip::udp::endpoint(asio::ip::make_address("8.8.8.8"), 80));
 		return Sock.local_endpoint().address().to_string();
 	}
 	catch (const std::exception&)