tests: revert testing against prerelease deps on Python 3.9#406

Merged

tseaver merged 1 commit intomasterfrom revert-402-401-test-against-prerelease-deps-under-3.9

Aug 18, 2021

-2

Commits on Aug 17, 2021

Revert "tests: allow prerelease deps on Python 3.9 (#402 )"
tseaver
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