Declare support for 3.13

Fixes: #1264.

Hardcode `LATEST_STABLE` in `noxfile.py` to be equal to the latest
stable Python release.

.github/workflows/ci.yml

@@ -87,6 +87,7 @@ jobs:
             3.10
             3.11
             3.12
+            3.13
             pypy3.10
           allow-prereleases: true
       - name: Set up nox

CHANGELOG.rst

@@ -1,3 +1,8 @@
+v4.22.1
+=======
+
+* Declare support for Py3.13
+
 v4.22.0
 =======
 

noxfile.py

@@ -35,13 +35,13 @@
     "The Unlicense (Unlicense)",
 ]
 
-SUPPORTED = ["3.8", "3.9", "3.10", "pypy3.10", "3.11", "3.12"]
-LATEST = SUPPORTED[-1]
+SUPPORTED = ["3.8", "3.9", "3.10", "pypy3.10", "3.11", "3.12", "3.13"]
+LATEST_STABLE = "3.12"
 
 nox.options.sessions = []
 
 
-def session(default=True, python=LATEST, **kwargs):  # noqa: D103
+def session(default=True, python=LATEST_STABLE, **kwargs):  # noqa: D103
     def _session(fn):
         if default:
             nox.options.sessions.append(kwargs.get("name", fn.__name__))

pyproject.toml

@@ -31,6 +31,7 @@ classifiers = [
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
   "Programming Language :: Python :: 3.12",
+  "Programming Language :: Python :: 3.13",
   "Programming Language :: Python :: Implementation :: CPython",
   "Programming Language :: Python :: Implementation :: PyPy",
   "Topic :: File Formats :: JSON",