textproc/py-os-api-ref: Update to 3.1.0

* Adjust USES=python accordingly, because Python 3.8 is no longer
  present in the ports tree after ca15850a2b while I'm here.

* Switch to the PEP517 build framework as well.

Changelog:

https://github.com/openstack/os-api-ref/compare/3.0.1...3.1.0

textproc/py-os-api-ref/Makefile

@@ -1,9 +1,9 @@
 PORTNAME=	os-api-ref
-DISTVERSION=	3.0.1
-PORTREVISION=	1
+DISTVERSION=	3.1.0
 CATEGORIES=	textproc python
 MASTER_SITES=	PYPI
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
+DISTNAME=	os_api_ref-${DISTVERSION}
 
 MAINTAINER=	kai@FreeBSD.org
 COMMENT=	Sphinx Extensions to support API reference sites in OpenStack
@@ -12,14 +12,16 @@ WWW=		https://docs.openstack.org/os-api-ref/
 LICENSE=	APACHE20
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
-BUILD_DEPENDS=	${PYTHON_PKGNAMEPREFIX}pbr>=2.0.0:devel/py-pbr@${PY_FLAVOR}
+BUILD_DEPENDS=	${PY_SETUPTOOLS} \
+		${PYTHON_PKGNAMEPREFIX}pbr>=2.0.0:devel/py-pbr@${PY_FLAVOR} \
+		${PYTHON_PKGNAMEPREFIX}wheel>0:devel/py-wheel@${PY_FLAVOR}
 RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}pbr>=2.0.0:devel/py-pbr@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}pyyaml>=3.12:devel/py-pyyaml@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}sphinx>=4.0.0,1:textproc/py-sphinx@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}openstackdocstheme>=2.2.1:textproc/py-openstackdocstheme@${PY_FLAVOR}
 
-USES=		python:3.9+
-USE_PYTHON=	distutils autoplist
+USES=		python
+USE_PYTHON=	autoplist pep517
 NO_ARCH=	yes
 
 .include <bsd.port.mk>

textproc/py-os-api-ref/distinfo

@@ -1,3 +1,3 @@
-TIMESTAMP = 1734262269
-SHA256 (os-api-ref-3.0.1.tar.gz) = 1900fe54853fb8b07c3bcec50c306a2fc094c9c91ab71ad3720014bd7b8d2107
-SIZE (os-api-ref-3.0.1.tar.gz) = 93116
+TIMESTAMP = 1747486530
+SHA256 (os_api_ref-3.1.0.tar.gz) = e5be28ef8354f0bd61f83d1f08744bc1b57dd8d0c8549ba6ed96beb5ebc0114b
+SIZE (os_api_ref-3.1.0.tar.gz) = 88655