Update actions/setup-python action to v6 (#389)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/coverage.yml

@@ -13,7 +13,7 @@ jobs:
     steps:
     - uses: actions/checkout@v6
     - name: Setup Python
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: 3.14
     - name: Install System Dependencies