Use pyproject.toml

[Christian-B]

Use pyyproject.toml

if this pr is approved it will be replicated without approval on most repositories.

tested with
https://github.com/SpiNNakerManchester/IntegrationTests/actions/runs/26281627917/job/77361823577

Note:
I had hoped to not repeat the version number but so far my attempts failed.

in pyproject.toml
[tool.setuptools.dynamic]
version = { attr = "spinn_utilities._version.version" }
gives:
configuration error: project must contain ['version'] properties

using
version = importlib.metadata.version("SpiNNUtilities")
cause various issues.

• may fail locally
• may pick info from an older egg
• may get AttributeError: module 'importlib' has no attribute 'metadata'
  • ref https://github.com/SpiNNakerManchester/IntegrationTests/actions/runs/26281094903/job/77361131831
  • adding dependencies = ... importlib-metadata did not help

[rowleya]

Seems reasonable; note that the setup.sh script in SupportScripts will likely also need updating as I assume you can't do python setup.py install any more!