Add Python 3.14 test (#19)

Author: zooba

.github/workflows/test.yml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       matrix:
         os: [windows-latest]
-        python-version: [3.9, '3.10', '3.11', '3.12', '3.13']
+        python-version: [3.9, '3.10', '3.11', '3.12', '3.13', '3.14-dev']
 
     env:
       PIP_DISABLE_PIP_VERSION_CHECK: true