johnthagen 1264d0465a
Fix documented Python version for venv --upgrade-deps (GH-22113)
Fixes incorrect Python version added for `venv` `--upgrade-deps` in #13100. This feature was added in Python 3.9 not 3.8.

Relates to:

- 
- 1cba1c9aba

Automerge-Triggered-By: @vsajip
2020-09-05 13:53:47 -07:00
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