Remove unused field tools.setuptools.dynamic

[jdblischak]

While working on the conda-forge feedstock for ome-zarr, I noticed that setuptools throws the warning _ToolsTypoInMetadata: Ignoring [tools.setuptools] in pyproject.toml, did you mean [tool.setuptools]?. It's ok that this field is ignored though, since it is no longer needed. According to the latest setuptools-scm usage docs, it is sufficient to have dynamic = ["version"] under [project].

xref: #346, conda-forge/ome-zarr-feedstock#24, conda-forge/ome-zarr-feedstock#26

Below is the code I ran to demonstrate that the version string is still automatically generated without this field:

python --version
## Python 3.11.13

git log -n 1 --pretty=reference
## ba98c05 (Merge pull request #450 from will-moore/changelog_0.11.1, 2025-04-23)

python -m venv venv-ome-zarr
source ./venv-ome-zarr/bin/activate
pip install build

python -m build .
##
## /tmp/build-env-qtd5fud6/lib/python3.11/site-packages/setuptools/config/pyprojecttoml.py:72: _ToolsTypoInMetadata: Ignoring [tools.setuptools] in pyproject.toml, did you mean [tool.setuptools]?
##  config = read_configuration(filepath, True, ignore_option_errors, dist)
##
## Successfully built ome_zarr-0.11.1.tar.gz and ome_zarr-0.11.1-py3-none-any.whl
ls dist/
## ome_zarr-0.11.1-py3-none-any.whl  ome_zarr-0.11.1.tar.gz
tar xzf dist/ome_zarr-0.11.1.tar.gz
tail -n 2 ome_zarr-0.11.1/ome_zarr/_version.py
## __version__ = version = '0.11.1'
## __version_tuple__ = version_tuple = (0, 11, 1)

git checkout -b remove-setuptools-field
# manually removed the field from pyproject.toml
rm -r dist/ ome_zarr-0.11.1/

python -m build .
## Successfully built ome_zarr-0.11.2.dev0+gba98c05.d20250611.tar.gz and ome_zarr-0.11.2.dev0+gba98c05.d20250611-py3-none-any.whl
ls dist/
## ome_zarr-0.11.2.dev0+gba98c05.d20250611-py3-none-any.whl  ome_zarr-0.11.2.dev0+gba98c05.d20250611.tar.gz
tar xzf dist/ome_zarr-0.11.2.dev0+gba98c05.d20250611.tar.gz
tail -n 2 ome_zarr-0.11.2.dev0+gba98c05.d20250611/ome_zarr/_version.py
## __version__ = version = '0.11.2.dev0+gba98c05.d20250611'
## __version_tuple__ = version_tuple = (0, 11, 2, 'dev0', 'gba98c05.d20250611')

[jdblischak]

@joshmoore please review

[joshmoore]

LGTM