chore(deps): update actions/setup-python action to v6

Author: renovate[bot]

.github/workflows/checks.yml

@@ -17,7 +17,7 @@ jobs:
     steps:
       - uses: actions/checkout@v5.0.0
       - name: Set up Python
-        uses: actions/setup-python@v5.6.0
+        uses: actions/setup-python@v6.0.0
         with:
           python-version: ${{ matrix.python }}
 
@@ -76,7 +76,7 @@ jobs:
     steps:
       - uses: actions/checkout@v5.0.0
       - name: Set up Python
-        uses: actions/setup-python@v5.6.0
+        uses: actions/setup-python@v6.0.0
         with:
           python-version: "3.9"
 
@@ -161,7 +161,7 @@ jobs:
     steps:
       - uses: actions/checkout@v5.0.0
       - name: Set up Python
-        uses: actions/setup-python@v5.6.0
+        uses: actions/setup-python@v6.0.0
         with:
           python-version: "3.9"
       - name: Get Python Version