Bump actions/setup-python from 5 to 6

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] <support@github.com>

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4.2.2
-    - uses: actions/setup-python@v5
+    - uses: actions/setup-python@v6
       with:
         python-version: 3.11
         cache: pip
@@ -46,7 +46,7 @@ jobs:
     - name: Checkout
       uses: actions/checkout@v4.2.2
     - name: Setup Python ${{ matrix.pyver }}
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: ${{ matrix.pyver }}
         cache: pip