Update Poetry version to 1.8.5 in workflow

[lswainemoore]

build & release seems to failing on poetry install. trying to pin it here, which seems to have worked. but now there are new issues:

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.15%. Comparing base (71b34c0) to head (b6e8fc3).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #33   +/-   ##
=======================================
  Coverage   98.15%   98.15%           
=======================================
  Files          23       23           
  Lines         649      649           
=======================================
  Hits          637      637           
  Misses         12       12           

Flag	Coverage Δ
unittests	98.15% <ø> (ø)

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