2026-05-30 version 8.0.0

• Add old style find boost applying option to cmake. (#1172)
• Add missing include type_traits (#1162)
• Remove duplicated include (#1156, #1157)
• Fix MSVC C++20 modules error for nested msgpack::object::with_zone (#1154)
• Refine CI (#1150, #1151, #1163)
• Refine documents (#1146, #1149)

<< breaking changes >>

• Update cmake minimum required to 3.5-4.0 (#1159)