Update boost to 1.86 (#592)

* Update to v1.85.0

* Boost example to 1.86

examples/boost/CMakeLists.txt

@@ -13,10 +13,12 @@ include(../../cmake/CPM.cmake)
 
 CPMAddPackage(
   NAME Boost
-  VERSION 1.84.0
-  URL https://github.com/boostorg/boost/releases/download/boost-1.84.0/boost-1.84.0.tar.xz
-  URL_HASH SHA256=2e64e5d79a738d0fa6fb546c6e5c2bd28f88d268a2a080546f74e5ff98f29d0e
-  OPTIONS "BOOST_ENABLE_CMAKE ON" "BOOST_INCLUDE_LIBRARIES container\\\;asio" # Note the escapes!
+  VERSION 1.86.0 # Versions less than 1.85.0 may need patches for installation targets.
+  URL https://github.com/boostorg/boost/releases/download/boost-1.86.0/boost-1.86.0-cmake.tar.xz
+  URL_HASH SHA256=2c5ec5edcdff47ff55e27ed9560b0a0b94b07bd07ed9928b476150e16b0efc57
+  OPTIONS "BOOST_ENABLE_CMAKE ON" "BOOST_SKIP_INSTALL_RULES ON" # Set `OFF` for installation
+          "BUILD_SHARED_LIBS OFF" "BOOST_INCLUDE_LIBRARIES container\\\;asio" # Note the escapes!
 )
 
+# `Boost::headers` is also valid
 target_link_libraries(CPMExampleBoost PRIVATE Boost::asio Boost::container)