consider updating gce warning about python 3.8

[dan-hexarcana]

algo/docs/deploy-from-cloudshell.md

Line 2 in 74051d0

**IMPORTANT NOTE: As of 2021-12-14 Algo requires Python 3.8, but Google Cloud Shell only provides Python 3.7.3. The instructions below will not work until Google updates Cloud Shell to have at least Python 3.8.**

dan@cloudshell:~ (REDACTED)$ python3 --version
Python 3.9.2

it appears that we have python3 3.9.2 at the time of writing so i think maybe we can remove it?