add python 3.14-dev to CI

Author: rthalley

.github/workflows/ci.yml

@@ -30,6 +30,7 @@ jobs:
           - "3.11"
           - "3.12"
           - "3.13"
+          - "3.14-dev"
           - "pypy3.10"
         exclude:
           - os: windows-latest