devel/py-pdm-backend: Update to 2.1.2

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

devel/py-pdm-backend/Makefile

 PORTNAME=	pdm-backend
-PORTVERSION=	2.1.0
+PORTVERSION=	2.1.2
 CATEGORIES=	devel python
 MASTER_SITES=	PYPI
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}

devel/py-pdm-backend/distinfo

-TIMESTAMP = 1686496756
-SHA256 (pdm_backend-2.1.0.tar.gz) = b853cb049244b697f5ebe9028d34418449130d6e12adf71b7661a4b95c342d59
-SIZE (pdm_backend-2.1.0.tar.gz) = 97508
+TIMESTAMP = 1688166230
+SHA256 (pdm_backend-2.1.2.tar.gz) = 1322399e3cbb85d3a95c761f671c7e9e5829a2d270bf576fa21ffbd71bd733e2
+SIZE (pdm_backend-2.1.2.tar.gz) = 97557