fix hash order dependency bug in new Module::Corelist::deprecated_in()

fix hash order dependency bug in new Module::Corelist::deprecated_in()

The code was doing

    $version= List::Util::min(keys %$versions);

which introduces a hash order dependency as min() returns either the first or last
(i didnt check which) of the lowest items in the list, and considers 5.011000 and
5.011 to be equivalent. Depending on the hash order it would return
either one. Hash randomization revealed this bug immediately.

Changing the function to use List::Util::minstr() eliminates the
dependency.

    $version= List::Util::minstr(keys %$versions);