Revert "refactor: Update to Boost 1.88 and 1.86" (#5872)

This change reverts #5570, and then also makes the same changes as was done in #5759 to revert to Boost 1.83. We would like to expose Boost 1.88 to more in-depth testing, but with release 3.0.0 coming out soon there is insufficient time to do so, hence the reversion to Boost 1.83 (skipping Boost 1.86 as it has a bug in the executors).

include/xrpl/net/HTTPClient.h

@@ -23,7 +23,7 @@
 #include <xrpl/basics/ByteUtilities.h>
 #include <xrpl/beast/utility/Journal.h>
 
-#include <boost/asio/io_context.hpp>
+#include <boost/asio/io_service.hpp>
 #include <boost/asio/streambuf.hpp>
 
 #include <chrono>
@@ -51,7 +51,7 @@ public:
 
     static void
     get(bool bSSL,
-        boost::asio::io_context& io_context,
+        boost::asio::io_service& io_service,
         std::deque<std::string> deqSites,
         unsigned short const port,
         std::string const& strPath,
@@ -65,7 +65,7 @@ public:
 
     static void
     get(bool bSSL,
-        boost::asio::io_context& io_context,
+        boost::asio::io_service& io_service,
         std::string strSite,
         unsigned short const port,
         std::string const& strPath,
@@ -80,7 +80,7 @@ public:
     static void
     request(
         bool bSSL,
-        boost::asio::io_context& io_context,
+        boost::asio::io_service& io_service,
         std::string strSite,
         unsigned short const port,
         std::function<