Pin 3.14 in python-315.yml

sphinxcontrib-jsmath not compatible with Python 3.15

Author: rffontenelle

.github/workflows/python-315.yml

@@ -18,12 +18,12 @@ jobs:
     uses: ./.github/workflows/sync.yml
     with:
       tx_project: python-newest
-      version: 3.15
+      version: 3.14
     secrets: inherit
   check:
     uses: ./.github/workflows/check.yml
     needs: sync
     with:
       tx_project: python-newest
-      version: 3.15
+      version: 3.14
     secrets: inherit