Disable experimental installer of poetry
Created by: arnaudsjs
Description
Poetry currently has a bug, which makes the poetry install command fail with a JSONDecodeError (See: https://github.com/python-poetry/poetry/issues/4210). Two workarounds exist:
- Clearing the poetry cache
- Disabling the experimental installer
This PR applies the second workaround, since clearing the cache would slow down the tests.
Jenkins was also giving a warning about the fact that the poetry.lock file was out of sync with the pyproject.toml file. A new poetry.lock file generates with the poetry lock command was added to this PR.
Self Check:
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Attached issue to pull request
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Changelog entry
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Type annotations are present
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Code is clear and sufficiently documented
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No (preventable) type errors (check using make mypy or make mypy-diff)
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Sufficient test cases (reproduces the bug/tests the requested feature)
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Correct, in line with design
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End user documentation is included or an issue is created for end-user documentation
Reviewer Checklist:
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Sufficient test cases (reproduces the bug/tests the requested feature) 
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Code is clear and sufficiently documented 
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Correct, in line with design