CI: Verify support on Python 3.13

Author: amotl

.github/workflows/tests.yml

@@ -27,7 +27,10 @@ jobs:
           "macos-12",
           "macos-latest",
         ]
-        python-version: ["3.7", "3.11", "3.12"]
+        python-version: [
+          "3.7",
+          "3.13",
+        ]
 
         # Run PyPy tests on Linux only.
         include:

pyproject.toml

@@ -44,6 +44,7 @@ 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",
   "Programming Language :: SQL",