Bump actions/setup-python from 5 to 6 (#541)

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 5 to 6.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](actions/setup-python@v5...v6)

---
updated-dependencies:
- dependency-name: actions/setup-python
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -22,7 +22,7 @@ jobs:
     - name: Checkout
       uses: actions/checkout@v5
     - name: Setup Python
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
     - name: Cache PyPI
       uses: actions/cache@v4
       with:
@@ -56,7 +56,7 @@ jobs:
     - name: Checkout
       uses: actions/checkout@v5
     - name: Setup Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: ${{ matrix.python-version }}
     - name: Get pip cache dir
@@ -112,7 +112,7 @@ jobs:
     - name: Checkout
       uses: actions/checkout@v5
     - name: Setup Python
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
     - name: Install dependencies
       uses: py-actions/py-dependency-install@v4
       with: