Extract duplicate DILL_VERSION checks to private function and add 0.3.9 support#2

Bomme merged 2 commits intobump_dill_to_039Bomme/datasets:bump_dill_to_039from

copilot/fix-3208024b-565c-4a22-9704-0609a8917f0eBomme/datasets:copilot/fix-3208024b-565c-4a22-9704-0609a8917f0eCopy head branch name to clipboard