switch to python 3.14 (w3c#13194)

Author: tabatkins

.github/workflows/build-specs.yml

@@ -30,7 +30,7 @@ jobs:
 
       - uses: actions/setup-python@v4
         with:
-          python-version: "3.10"
+          python-version: "3.14"
           cache: 'pip'
 
       - run: pip install bikeshed