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/pypi-release.yml

@@ -12,7 +12,7 @@ jobs:
       - uses: actions/checkout@v4
         with:
           fetch-depth: 0
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         name: Install Python
         with:
           python-version: 3.13
@@ -45,7 +45,7 @@ jobs:
     needs: build-artifacts
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         name: Install Python
         with:
           python-version: 3.13