Change Details

> refactor: replace Boost shared_mutex with std shared_mutex in cuckoocache tests > refactor: replace Boost shared_mutex with std shared_mutex in sigcache > build: don't build or use Boost Thread Co-authored-by: MarcoFalke falke.marco@gmail.com Co-authored-by: sinetek pitwuu@gmail.com This is a backport of core#21064 Depends on D13963

> refactor: replace Boost shared_mutex with std shared_mutex in cuckoocache tests > refactor: replace Boost shared_mutex with std shared_mutex in sigcache > build: don't build or use Boost Thread Co-authored-by: MarcoFalke falke.marco@gmail.com Co-authored-by: sinetek pitwuu@gmail.com This is a backport of [[https://github.com/bitcoin/bitcoin/pull/21064 | core#21064]] Depends on D13963

> refactor: replace Boost shared_mutex with std shared_mutex in cuckoocache tests > refactor: replace Boost shared_mutex with std shared_mutex in sigcache > build: don't build or use Boost Thread Co-authored-by: MarcoFalke falke.marco@gmail.com Co-authored-by: sinetek pitwuu@gmail.com This is a backport of [[https://github.com/bitcoin/bitcoin/pull/21064 | core#21064]] Depends on D13963