Add Python 3.13 and 3.14 to workflow matrix

Author: laisee

.github/workflows/rufflint.yml

@@ -12,7 +12,7 @@ jobs:
 
     strategy:
       matrix:
-        python-version: [3.8, 3.9, 3.11, 3.12]
+        python-version: [3.8, 3.9, 3.11, 3.12, 3.13, 31.4]
 
     steps:
     - uses: actions/checkout@v2