Fix Poetry installation in CI

[tasansal]

See this discussion:

python-poetry/poetry#6567

https://github.com/geoabraham/practical-cli-game/pull/37/files#diff-1db27d93186e46d3b441ece35801b244db8ee144ff1405ca27a163bfe878957f

[codecov-commenter]

Codecov Report

Merging #191 (ae0f880) into main (0e2d732) will not change coverage.
The diff coverage is n/a.

❗ Current head ae0f880 differs from pull request most recent head ff8eaa1. Consider uploading reports for the commit ff8eaa1 to get more accurate results

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@@           Coverage Diff           @@
##             main     #191   +/-   ##
=======================================
  Coverage   80.60%   80.60%           
=======================================
  Files          43       43           
  Lines        1676     1676           
  Branches      189      189           
=======================================
  Hits         1351     1351           
  Misses        285      285           
  Partials       40       40           

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