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] <[email protected]>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -28,7 +28,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
       - name: Setup Python 3.9
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: ${{env.pythonversion}}
         #----------------------------------------------
@@ -100,7 +100,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
       - name: Setup Python ${{ matrix.pyver }}
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.pyver }}
         #----------------------------------------------

.github/workflows/pypi-publish.yaml

@@ -27,7 +27,7 @@ jobs:
           value: "${{ steps.get_version.outputs.VERSION }}"
 
       - name: Set up Python 3.9
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: 3.9