Gcc10 compilation error:: std::__uniq_ptr_data<ROOT::Experimental::TTaskGroup, std::default_delete<ROOT::Experimental::TTaskGroup>

Hi,

I think this is the same issue as:

https://root-forum.cern.ch/t/fail-to-compile-root-6-20-04-on-fedora-32

which resulted in:

The ticket above is closed so I understand this has been fixed in a more recent version (I am not sure which one since the ticket does not specify it).

@oksana @vvassilev do you want to comment?