Fix for ATLASRECTS-7866

Closes ATLASRECTS-7866

https://en.cppreference.com/w/cpp/memory/unique_ptr/operator_ltlt

Inserts the value of the pointer managed by p into the output stream os.

is a C++20 feature.

Since it is :

Equivalent to os << p.get().

use that since we need C++17 for the gcc11 builds