Limit Github CI to 3.13 because of missing BPL

Author: inducer

.github/workflows/ci.yml

@@ -30,7 +30,9 @@ jobs:
         runs-on: ubuntu-latest
         strategy:
             matrix:
-                python-version: ['3.10', '3.12', '3.x']
+                # Limited to 3.13 because Github CI didn't have Boost.Python for
+                # 3.14 yet.
+                python-version: ['3.10', '3.12', '3.13']
         steps:
         -   uses: actions/checkout@v5
         -