Bump actions/setup-python from 5 to 6 (#61)

Author: dependabot[bot]

.github/workflows/check.yml

@@ -20,7 +20,7 @@ jobs:
         uses: actions/checkout@v5
 
       - name: Setup Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ env.PYTHON }}