⬆️ Update actions/setup-python action to v6 (#1327)

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

Author: renovate[bot]

.github/workflows/update-test-matrix.yaml

@@ -19,7 +19,7 @@ jobs:
         uses: actions/checkout@v6
 
       - name: Set up Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: "3.12.12"