Add Python 3.14 to self-hosted CI runner workflow

Author: pushfoo

.github/workflows/selfhosted_runner.yml

@@ -18,7 +18,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: ['3.10', '3.11', '3.12', '3.13']
+        python-version: ['3.10', '3.11', '3.12', '3.13', '3.14']
         architecture: ['x64']
 
     steps: