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

@@ -21,7 +21,7 @@ jobs:
 
     steps:
       - uses: "actions/checkout@v4"
-      - uses: "actions/setup-python@v5"
+      - uses: "actions/setup-python@v6"
         with:
           python-version: ${{ matrix.python-version }}
       - name: "Install dependencies"
@@ -51,7 +51,7 @@ jobs:
       TOXENV: ${{ matrix.toxenv }}
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: 3.13
       - name: "Install dependencies"