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removed <py37 restriction, added dev_url

Co-authored-by: Julian Rüth <cb523fa11bd4c710cc4196ce082618a6fa1d9510@fsfe.org>
conda-forge/staged-recipes,johanneskoester/staged-recipes,ocefpaf/staged-recipes,ocefpaf/staged-recipes,conda-forge/staged-recipes,johanneskoester/staged-recipes