chore(python): update dependencies in .kokoro#280

gcf-owl-bot[bot] wants to merge 2 commits intomaingoogleapis/python-db-dtypes-pandas:mainfrom

owl-bot-update-lock-99ab465187b4891e878ee4f9977b4a6aeeb0ceadf404870c416c50e06500eb42googleapis/python-db-dtypes-pandas:owl-bot-update-lock-99ab465187b4891e878ee4f9977b4a6aeeb0ceadf404870c416c50e06500eb42Copy head branch name to clipboard