fixup! Add support for Python 3.15

Author: hugovk

.github/workflows/tests.yml

@@ -15,7 +15,7 @@ jobs:
         python-version: ["3.15", "3.14", "3.13", "3.12"]
         include:
           - python-version: "3.15"
-            branch: "origin/main"
+            branch: "main"
     steps:
       - uses: actions/checkout@v5
       - uses: actions/setup-python@v6