Update to current meta/config.

Remove preliminary Python 3.13 support as it requires a cffi release first.

.meta.toml

@@ -2,13 +2,13 @@
 # https://github.com/zopefoundation/meta/tree/master/config/c-code
 [meta]
 template = "c-code"
-commit-id = "a361e1fd"
+commit-id = "cb0568c7"
 
 [python]
 with-appveyor = true
 with-windows = false
 with-pypy = false
-with-future-python = true
+with-future-python = false
 with-sphinx-doctests = false
 with-macos = false
 

tox.ini

@@ -38,21 +38,31 @@ commands =
     coverage run -m zope.testrunner --test-path=src {posargs:-vc}
     coverage html -i
     coverage report -i -m --fail-under=80
-
-[testenv:lint]
+[testenv:release-check]
+description = ensure that the distribution is ready to release
 basepython = python3
 skip_install = true
+deps =
+    twine
+    build
+    check-manifest
+    check-python-versions >= 0.20.0
+    wheel
 commands =
-    isort --check-only --diff {toxinidir}/src {toxinidir}/setup.py
-    flake8 src setup.py
     check-manifest
     check-python-versions
+    python -m build --sdist --no-isolation
+    twine check dist/*
+
+[testenv:lint]
+basepython = python3
+skip_install = true
 deps =
-    check-manifest
-    check-python-versions >= 0.19.1
-    wheel
-    flake8
     isort
+    flake8
+commands =
+    isort --check-only --diff {toxinidir}/src {toxinidir}/setup.py
+    flake8 src setup.py
 
 [testenv:isort-apply]
 basepython = python3