Add 2022-10-20-Umich workshop to workshops list

[sklucas]

Hi! I'd like to update the workshops list to reflect the upcoming event.

title: Workshop
date: 2022-10-20
end_date: 2022-10-21
instructors:

• Sarah Lucas
• Kelly Sovacool
• Nick Lesniak
• Pat Schloss
• Corwin Kerr
  helpers:
• Grace Kenney
• Pariksheet Nanda
  site: https://umcarpentries.org/2022-10-20-UMich/
  registration: https://ttc.iss.lsa.umich.edu/ttc/sessions/software-carpentry-workshop-unix-r-and-git/
  material: R, bash, git
  audience: University of Michigan researchers

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[kelly-sovacool]

I setup a cron job via GitHub Actions to do this automagically once per week, but for some reason GitHub Actions hasn't actually run that job in a long time. I'll try to trigger it manually.