ci: update setup-python to node24-ready version

Author: edengilbertus

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ jobs:
     steps:
       - uses: actions/checkout@v5
       - uses: dtolnay/rust-toolchain@stable
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: '3.11'
       - run: python -m venv .venv