Bump poetry version and bust dependency cache

[aherbst-broad]

Why

Our master CI is failing and it looks like it may be this poetry bug.

This PR

• Bumps the poetry version and busts the dependency cache to ensure we reverify the hashes on all deps.

Checklist

• Documentation has been updated as needed.

[codecov]

Codecov Report

Merging #220 (844a8d0) into master (66c5133) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #220   +/-   ##
=======================================
  Coverage   95.48%   95.48%           
=======================================
  Files           4        4           
  Lines         155      155           
  Branches        1        1           
=======================================
  Hits          148      148           
  Misses          7        7           

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[quazi-h]

lgtm