Allow to use the package with Python 3.13

See #264.

.github/workflows/tests.yml

@@ -27,7 +27,8 @@ jobs:
         - ["3.9",   "py39"]
         - ["3.10",  "py310"]
         - ["3.11",  "py311"]
-        - ["3.12.0-rc.3",  "py312"]
+        - ["3.12",  "py312"]
+        - ["3.13.0-alpha - 3.13.0",  "py313"]
         - ["3.9",   "docs"]
         - ["3.9",   "coverage"]
         - ["3.9",   "py39-datetime"]

.meta.toml

@@ -2,7 +2,7 @@
 # https://github.com/zopefoundation/meta/tree/master/config/pure-python
 [meta]
 template = "pure-python"
-commit-id = "b21fbbf2"
+commit-id = "13b9049c"
 
 [python]
 with-pypy = false

CHANGES.rst

@@ -12,8 +12,8 @@ Backwards incompatible changes
 Features
 ++++++++
 
-- Allow to use the package with Python 3.12 -- Caution: No security audit has
-  been done so far.
+- Allow to use the package with Python 3.12 and 3.13 -- Caution: No security
+  audit has been done so far.
 
 Fixes
 +++++

setup.py

@@ -67,7 +67,7 @@ def read(*rnames):
     package_dir={'': 'src'},
     install_requires=[
     ],
-    python_requires=">=3.7, <3.13",
+    python_requires=">=3.7, <3.14",
     tests_require=tests_require,
     extras_require={
         'test': tests_require,

tox.ini

@@ -3,13 +3,15 @@
 [tox]
 minversion = 3.18
 envlist =
+    release-check
     lint
     py37
     py38
     py39
     py310
     py311
     py312
+    py313
     docs
     coverage
     py39-datetime
@@ -19,7 +21,7 @@ envlist =
 usedevelop = true
 package = wheel
 wheel_build_env = .pkg
-pip_pre = py312: true
+pip_pre = py313: true
 deps =
     datetime: DateTime
     -cconstraints.txt
@@ -53,21 +55,31 @@ commands =
     coverage html
     coverage report -m --fail-under=100
 depends = py37,py38,py39,py39-datetime,py310,py311,py312coverage
-
-[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 {toxinidir}/tests
-    flake8 src setup.py tests
     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 {toxinidir}/tests
+    flake8 src setup.py tests
 
 [testenv:isort-apply]
 basepython = python3