Bump actions/download-artifact from 5 to 6

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 5 to 6.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v5...v6)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  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/build-and-publish.yml

@@ -51,7 +51,7 @@ jobs:
       (github.event_name == 'push' && github.ref == 'refs/heads/main')
     steps:
       - name: Download distribution packages
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: python-package-distributions
           path: dist/
@@ -72,7 +72,7 @@ jobs:
     if: github.event_name == 'release' && github.event.action == 'published'
     steps:
       - name: Download distribution packages
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: python-package-distributions
           path: dist/