Conform pyproject to PEP 621

[aliberts]

What this does

⚠️ DO NOT MERGE YET
Poetry 2.0.0 seems to have performance issues when solving dependencies.
Generating this new poetry.lock file took more than 17mn (1038.1s)
Using the --regenerate option, this was even worse as I had to killed it after 47mn (it hadn't finished)
Resolved with poetry 2.1.0

This standardizes the pyproject.toml to conform exactly to PEP 621 as it's now possible to do with poetry 2 which just released.

Users of poetry will need to update their version of poetry.

If you installed poetry with the installer script:

poetry self update

If you installed poetry using pipx:

pipx upgrade poetry

Note that the commands changed slightly, here are the equivalent for the most common ones:

# install all extras
- poetry install --sync --all-extras
+ poetry sync --all-extras

# update lock file from pyproject.toml with no version upgrade in lock file
- poetry lock --no-update
+ poetry lock

# update lock file from pyproject.toml with versions upgrade in lock file
- poetry lock
+ poetry lock --regenerate

More details in the release notes

How it was tested

Project still installs correctly, no regression observed with poetry 2.1.0