[smart_holder] Make smart holder type caster of `unique_ptr` accept `automatic_reference`#4775

rwgk merged 5 commits intopybind:smart_holderpybind/pybind11:smart_holderfrom

wangxf123456:unique_ptr_automatic_referencewangxf123456/pybind11:unique_ptr_automatic_referenceCopy head branch name to clipboard