[ci] Bump Python to 3.14 in sync-device-classes workflow (#14912)

.github/workflows/sync-device-classes.yml

@@ -24,7 +24,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
         with:
-          python-version: 3.13
+          python-version: "3.14"
 
       - name: Install Home Assistant
         run: |