Update Poetry to version 1.4.2

Description

As the title says, this MR updates Poetry to version 1.4.2.

It revealed necessary due to a breaking change in the PyPI API that was leaving the poetry.lock metadata.files table empty. Instead of staying on an old and unpinned version, this commit updates Poetry to the latest stable version and pins it.

Note that it introduces a new poetry.lock version (2.0) that requires a modern Poetry version. Update your installations (and clean your caches)!

Related Issue

How Has This Been Tested?

• The development workflow behaves as expected
• The CI passes

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.