Switch to 'build' for loading package metadata.

Required disabling doctests due to pytest-dev/pytest#3396 and the fact that build imports `packaging`.

CHANGES.rst

@@ -1,3 +1,8 @@
+v9.1.0
+======
+
+Prefer ``build`` to ``pep517`` for loading package metadata.
+
 v9.0.0
 ======
 

jaraco/packaging/sphinx.py

@@ -1,7 +1,7 @@
 import os
 import subprocess
 
-import pep517.meta
+from build.util import project_wheel_metadata as load_metadata
 
 try:
     import importlib.metadata as metadata
@@ -27,7 +27,7 @@ def load_config_from_setup(app):
     """
     # for now, assume project root is one level up
     root = os.path.join(app.confdir, '..')
-    meta = pep517.meta.load(root).metadata
+    meta = load_metadata(root)
     app.config.project = meta['Name']
     app.config.version = app.config.release = meta['Version']
     app.config.package_url = meta['Home-page']

pytest.ini

@@ -1,6 +1,7 @@
 [pytest]
 norecursedirs=dist build .tox .eggs
-addopts=--doctest-modules
+# Disabled due to pytest-dev/pytest#3396
+# addopts=--doctest-modules
 doctest_optionflags=ALLOW_UNICODE ELLIPSIS
 filterwarnings=
 	# Suppress deprecation warning in flake8

setup.cfg

@@ -19,7 +19,7 @@ include_package_data = true
 python_requires = >=3.7
 install_requires =
 	importlib_metadata; python_version < "3.8"
-	pep517
+	build
 
 [options.packages.find]
 exclude =