devel/py-pipdeptree: Fix runtime

At runtime the program crashes due to an error like the following:
ImportError: cannot import name '__version__' from 'pipdeptree.version'

Which is caused due to the new template format of the setuptools_scm.
Currently this is just a dirty hack to support older(<7) setuptools_scm
format.

PR:		274101
Reported by:	vedran@miletic.net

devel/py-pipdeptree/Makefile

@@ -1,5 +1,6 @@
 PORTNAME=	pipdeptree
 PORTVERSION=	2.13.0
+PORTREVISION=	1
 CATEGORIES=	devel python
 MASTER_SITES=	PYPI
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
@@ -20,4 +21,8 @@ USE_PYTHON=	autoplist concurrent pep517 pytest
 
 NO_ARCH=	yes
 
+post-patch:
+	@${REINPLACE_CMD} -e 's|import __version__|import version as __version__|g' \
+		${WRKSRC}/src/pipdeptree/_cli.py
+
 .include <bsd.port.mk>