Enable Python 3.13-dev builds and testing on GitHub.

Author: GrahamDumpleton

.github/workflows/main.yml

@@ -16,7 +16,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13-dev"]
     steps:
       - uses: "actions/checkout@v4"
       - uses: "actions/setup-python@v5"
@@ -42,7 +42,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13-dev"]
     steps:
       - uses: "actions/checkout@v4"
       - uses: "actions/setup-python@v5"

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py38,py39,py310,py311,py312
+envlist = py38,py39,py310,py311,py312,py313
 
 [gh-actions]
 python =
@@ -8,3 +8,4 @@ python =
     3.10: py310
     3.11: py311
     3.12: py312
+    3.13: py313