Bump actions/download-artifact from 5 to 6 (#4427)

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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/deploy.yml

@@ -185,13 +185,13 @@ jobs:
 
       - name: Download web (only for master)
         if: github.ref == 'refs/heads/master'
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: foreman-docs-web-${{ env.BRANCH_NAME }}
           path: public
 
       - name: Download HTML
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: foreman-docs-html-${{ env.BRANCH_NAME }}
           path: public/${{ env.BRANCH_NAME }}