Add Python version 3.14 to workflow matrix

Author: sba72

.github/workflows/test-build.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        version: [ '3.15' ]   # version: [ '3.15', '3.14' ]
+        version: [ '3.15', '3.14' ]
         format: [ html, latex ]
     steps:
       - uses: actions/setup-python@master
@@ -47,7 +47,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        version: [ '3.15' ]   # version: [ '3.15', '3.14' ]
+        version: [ '3.15', '3.14' ]
     needs: [ 'build-translation' ]
     steps:
       - uses: actions/download-artifact@master