tests: allow prerelease deps on Python 3.9 (#415)

Closes #414.
googleapis · Aug 12, 2021 · a1e9a16 · a1e9a16
1 parent 639d552
commit a1e9a16
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/testing/constraints-3.9.txt b/testing/constraints-3.9.txt
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+# Allow prerelease requirements
+--pre