Update keyring version from "^19.0" to ">19.0, <22.0"

[micahellison]

Fixes #783 AUR packaging issue. I checked all dependencies for their latest versions, and only keyring had more recent versions, so I'm allowing all versions up to and including 21.x.

The other changes in the lockfile reflect updates to dependencies of dependencies when running poetry update.

Moving forward, we'll plan to do this exercise a couple times each year to take advantage of the latest updates to our dependencies.

Checklist

• The code change is tested and works locally.
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• There is no commented out code in this PR.
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• [n/a] Have you written new tests for your core changes, as applicable?

[wren]

🥔