pyproject: add dependency group for test deps

Add a PEP 735 dependency group that installs a supported version of
pytest.  This allows downstream build systems (e.g. Fedora) to autodetect
test dependencies.  pip 25.1 allows installing these dependencies with
`pip install --group test`.

Signed-off-by: Benjamin Gilbert <[email protected]>

Author: bgilbert

pyproject.toml

@@ -36,6 +36,9 @@ Documentation = "https://openslide.org/api/python/"
 "Release notes" = "https://github.com/openslide/openslide-python/blob/main/CHANGELOG.md"
 Repository = "https://github.com/openslide/openslide-python"
 
+[dependency-groups]
+test = ["pytest >= 7"]
+
 [tool.setuptools]
 include-package-data = false
 packages = ["openslide"]