Update Python version in GitHub Actions workflow

Author: surister

.github/workflows/tests.yml

@@ -23,8 +23,8 @@ jobs:
       matrix:
         os: ['ubuntu-latest']
         python-version: [
-          '3.9',
           '3.13',
+          '3.14',
         ]
         dlt-version: [
           '1.10.*',