Updated poetry to latest versions

[jacobcook1995]

Description

The CI GitHub Action has a problem where occasionally a run will fail during the install dependancies step (see here). This generally seems to happen on Windows with python version 3.10.

This PR updates poetry to latest version in case this is a poetry bug which has already been patched out. If it isn't then we'll have to investigate further.

(Updating poetry from 1.2.2 to 1.5.1 seems to halve dependancy install times, so I think this change is worthwhile regardless of if it fixes the bug)

Type of change

• New feature (non-breaking change which adds functionality)
• Optimization (back-end change that speeds up the code)
• Bug fix (non-breaking change which fixes an issue)

Key checklist

• Make sure you've run the pre-commit checks: $ pre-commit run -a
• All tests pass: $ poetry run pytest

Further checks

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[davidorme]

That's a lot of minor version changes in quite a short space of time! Still - they've been deprecating a load of old pre 1.00 options and updating stuff! Seems fine to me.

[davidorme]

And it looks like one of those changes is explicitly updating to a 'modern' installer for packages.