feat(manager/poetry): extract python as a dependency from pyproject.toml

[zeshuaro]

Changes

• Update poetry manager to extract python as a dependency from pyproject.toml so that its version can be updated
• Update artifact.getPythonConstraint to first attempt to read the python version from pyproject.toml first as it could have been updated then fallback to read from poetry.lock

Context

#19144

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please select one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository
  • Update Python to v3.11.5 barriot/r0#16 - updated python version
  • Update dependency requests to ^2.31.0 barriot/r0#11 - confirmed that existing package update still works

[renovate-release]

🎉 This PR is included in version 36.80.0 🎉

The release is available on:

• GitHub release
• 36.80.0

Your semantic-release bot 📦🚀

[rarkins]

FYI I am rolling this back due to two reported problems so far:

• How to change poetry manager python pinning behavior? #24254
• treating python version as a dependency in pyproject.toml using incorrect lookups #24256

[zeshuaro]

Sorry about that, didn't realise the side effects of these changes.