devel/py-jsonschema: Update version 4.19.2=>4.20.0

Changelog:
https://github.com/python-jsonschema/jsonschema/releases/tag/v4.20.0

devel/py-jsonschema/Makefile

 PORTNAME=	jsonschema
-PORTVERSION=	4.19.2
+PORTVERSION=	4.20.0
 CATEGORIES=	devel python
 MASTER_SITES=	PYPI
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}

devel/py-jsonschema/distinfo

-TIMESTAMP = 1698753577
-SHA256 (jsonschema-4.19.2.tar.gz) = c9ff4d7447eed9592c23a12ccee508baf0dd0d59650615e847feb6cdca74f392
-SIZE (jsonschema-4.19.2.tar.gz) = 318786
+TIMESTAMP = 1700684646
+SHA256 (jsonschema-4.20.0.tar.gz) = 4f614fd46d8d61258610998997743ec5492a648b33cf478c1ddc23ed4598a5fa
+SIZE (jsonschema-4.20.0.tar.gz) = 320243