devel/py-diskcache: Switch to Django 4.2

* Django 4.1 reaches its End-of-Life at 2023-12-31 thus switch to
  Django 4.2 which has long-term support.

* Update test suite as well and switch to USE_PYTHON=pytest.

  Although devel/py-tox is specified in "setup.py" for the test suite,
  the use of pytest (or unittest) in terms of FreeBSD ports on
  downstream side makes more sense and give better results.

  This is because the tests are carried out within the native system
  environment and are therefore also tested against the Python version
  and packages/ports that are actually installed.

* Bump PORTREVISION due changed dependencies.

PR:		275212
Approved by:	maintainer timeout (2+ weeks)

devel/py-diskcache/Makefile

@@ -1,6 +1,7 @@
 PORTNAME=	diskcache
 DISTVERSIONPREFIX=	v
 DISTVERSION=	5.6.1
+PORTREVISION=	1
 CATEGORIES=	devel python
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
@@ -10,18 +11,19 @@ WWW=		https://grantjenks.com/docs/diskcache/
 
 LICENSE=	APACHE20
 
-PY_DEPENDS=	${PYTHON_PKGNAMEPREFIX}django41>0:www/py-django41@${PY_FLAVOR}
+PY_DEPENDS=	${PYTHON_PKGNAMEPREFIX}django42>0:www/py-django42@${PY_FLAVOR}
 BUILD_DEPENDS=	${PY_DEPENDS}
 RUN_DEPENDS=	${PY_DEPENDS}
-TEST_DEPENDS=	${PYTHON_PKGNAMEPREFIX}tox>0:devel/py-tox@${PY_FLAVOR}
 
 USES=		python
-USE_PYTHON=	distutils autoplist unittest # 1 test fails, see https://github.com/grantjenks/python-diskcache/issues/262
+USE_PYTHON=	distutils autoplist pytest
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	grantjenks
 GH_PROJECT=	python-diskcache
 
+TEST_ENV=	PYTHONPATH=${STAGEDIR}${PYTHONPREFIX_SITELIBDIR}
+
 NO_ARCH=	yes
 
 .include <bsd.port.mk>