Update actions/setup-python action to v6 (#336)

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

Author: renovate[bot]

.github/workflows/verify.yml

@@ -29,7 +29,7 @@ jobs:
         uses: actions/checkout@v5
       - name: Set up Python and determine minor version for ${{ env.DEFAULT_PYTHON }}
         id: python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ env.DEFAULT_PYTHON }}
       - name: Compute cache key
@@ -46,7 +46,7 @@ jobs:
         uses: actions/checkout@v5
       - name: Set up Python ${{ needs.cache.outputs.python-version }}
         id: python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ needs.cache.outputs.python-version }}
       - name: Create or reuse cache
@@ -72,7 +72,7 @@ jobs:
           persist-credentials: false
       - name: Set up Python ${{ needs.cache.outputs.python-version }}
         id: python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ needs.cache.outputs.python-version }}
       - name: Create or reuse cache
@@ -113,7 +113,7 @@ jobs:
         uses: actions/checkout@v5
       - name: Set up Python ${{ needs.cache.outputs.python-version }}
         id: python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ needs.cache.outputs.python-version }}
       - name: Create or reuse cache
@@ -153,7 +153,7 @@ jobs:
         uses: actions/checkout@v5
       - name: Set up Python ${{ matrix.python-version }}
         id: python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python-version }}
       - name: Create or reuse cache
@@ -192,7 +192,7 @@ jobs:
           persist-credentials: false
       - name: Set up Python ${{ needs.cache.outputs.python-version }}
         id: python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ needs.cache.outputs.python-version }}
       - name: Create or reuse cache
@@ -242,7 +242,7 @@ jobs:
         uses: actions/checkout@v5
       - name: Set up Python ${{ needs.cache.outputs.python-version }}
         id: python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ needs.cache.outputs.python-version }}
       - name: Create or reuse cache
@@ -335,7 +335,7 @@ jobs:
         uses: actions/checkout@v5
       - name: Set up Python ${{ needs.cache.outputs.python-version }}
         id: python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ needs.cache.outputs.python-version }}
       - name: Create or reuse cache