2.1.1

• automatically determine target gid & uid
• update nlohmann/json library to v3.11.2 (https://github.com/nlohmann/json/releases/tag/v3.11.2)
• update fmt library to v9.1.0 (https://github.com/fmtlib/fmt/releases/tag/9.1.0)
• update spdlog library to v1.11.0 (https://github.com/gabime/spdlog/releases/tag/v1.11.0)
• update cxxopts library to v3.0.0 (https://github.com/jarro2783/cxxopts/releases/tag/v3.0.0)
• update bone_helper submodule to use boost::asio
• add IPv6 support
• allow to use statically compiled OpenSSL 3
• allow to use with musl
• require C++20