devel/py-types-jsonschema: update to 4.26.0.20260325

Following upstream changes, switch to PEP517 build with the default
setuptools. Apply even more workarounds for the elderl version of
setuptools in ports.

Changes: https://github.com/typeshed-internal/stub_uploader/blob/main/data/changelogs/jsonschema.md
Reported by: replogy