Bump actions/setup-python from 5 to 6 (#710)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -21,7 +21,7 @@ jobs:
     - name: Checkout
       uses: actions/checkout@v5
     - name: Setup Python
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: 3.9
         cache: 'pip'
@@ -60,7 +60,7 @@ jobs:
     - name: Checkout
       uses: actions/checkout@v5
     - name: Setup Python ${{ matrix.pyver }}
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: ${{ matrix.pyver }}
         cache: 'pip'
@@ -104,7 +104,7 @@ jobs:
     - name: Checkout
       uses: actions/checkout@v5
     - name: Setup Python
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: 3.13
     - name: Install dependencies