new: ci: Add GNU Make --shuffle option

GNU Make 4.4 introduced the --shuffle option to randomize the order of
goal targets and prerequisites. This helps detect hidden dependencies
and improve build robustness by exposing order-related issues during
parallel builds.

See:

    https://trofi.github.io/posts/238-new-make-shuffle-mode.html
    https://www.gnu.org/software/make/manual/html_node/Options-Summary.html#index-_002d_002dshuffle

Merge branch 'mnowak/add-gnu-make-shuffle-options' into 'bind-9.20'

See merge request isc-projects/bind9!10460