[enh] 3.8: Install git, pre-commit, isort, and pyupgrade

pre-commit is not available in Buster, will be in Bullseye
4 jobs for 1.2.0 in 4 minutes and 20 seconds (queued for 5 seconds)
Status Name Job ID Coverage
  Test
passed build_3_6 #56717
docker

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passed build_3_7 #56718
docker

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passed build_3_8 #56719
docker

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passed build_3_9 #56720
docker

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