ci: require that the poetry lock file is up to date

[nh13]

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[codecov-commenter]

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##             MS_rtd_theme      #64   +/-   ##
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  Coverage                ?   92.90%           
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  Files                   ?       30           
  Lines                   ?     3016           
  Branches                ?      559           
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  Hits                    ?     2802           
  Misses                  ?      143           
  Partials                ?       71           

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[nh13]

@msto so basically I had to:

1. update the version of poetry we require to 1.5
2. add poetry lock --check to our github action
3. add the sphinx_rtd_theme dependency to the pyproject.yaml. I think you had added it manually as part of the docs, but didn't add it to the main dependency. Take a look. The typical way to add a new dependency is with poetry add.
4. cherry-pick ed6df15 from refactor: use pathlib in tests #65

[msto]

🙌