ci: bump actions/setup-python from 5.5.0 to 5.6.0

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 5.5.0 to 5.6.0.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](https://github.com/actions/setup-python/compare/v5.5.0...v5.6.0)

---
updated-dependencies:
- dependency-name: actions/setup-python
  dependency-version: 5.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/build.yml

@@ -310,7 +310,7 @@ jobs:
         name: src.tar.gz
     - name: Extract source package
       run: tar xf src.tar.gz
-    - uses: actions/setup-python@v5.5.0
+    - uses: actions/setup-python@v5.6.0
       with:
         python-version: '3.12'
     - name: Install dependencies