fixup! Add support for Python 3.15

Author: hugovk

.github/workflows/tests.yml

@@ -20,7 +20,7 @@ jobs:
       - uses: actions/checkout@v5
       - uses: actions/setup-python@v6
         with:
-          python-version: ${{ matrix.branch }}
+          python-version: ${{ matrix.python-version }}
           allow-prereleases: true
           cache: pip
       - name: Clone docsbuild scripts