tests: revert testing against prerelease deps on Python 3.9 (googleap…

…is#527) Consensus from today's meeting is that testing against prereleases needs to happen outside the normal presubmit path. Reverts only part of PR googleapis#479.
sunny1612 · Aug 18, 2021 · 33f00ab · 33f00ab
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diff --git a/testing/constraints-3.9.txt b/testing/constraints-3.9.txt
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-# Allow prerelease requirements
---pre