devel/py-pdm-backend: Update to 2.4.2

Changes:	https://github.com/pdm-project/pdm-backend/releases

devel/py-pdm-backend/Makefile

 PORTNAME=	pdm-backend
-PORTVERSION=	2.4.1
+PORTVERSION=	2.4.2
 CATEGORIES=	devel python
 MASTER_SITES=	PYPI
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}

devel/py-pdm-backend/distinfo

-TIMESTAMP = 1727314560
-SHA256 (pdm_backend-2.4.1.tar.gz) = d6404e94a612459c5213cc63df035711244173c57441b8312a2a6f4a8c110934
-SIZE (pdm_backend-2.4.1.tar.gz) = 112629
+TIMESTAMP = 1728922898
+SHA256 (pdm_backend-2.4.2.tar.gz) = 1f833e527ae172f34b4b84e2fcf1f65859a2a5ca746e496d8313b3ea6539969f
+SIZE (pdm_backend-2.4.2.tar.gz) = 117358