Bump dawidd6/action-download-artifact from 5 to 6

Bumps [dawidd6/action-download-artifact](https://github.com/dawidd6/action-download-artifact) from 5 to 6.
- [Release notes](https://github.com/dawidd6/action-download-artifact/releases)
- [Commits](dawidd6/action-download-artifact@v5...v6)

---
updated-dependencies:
- dependency-name: dawidd6/action-download-artifact
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/post-outdated-content-report.yaml

@@ -50,7 +50,7 @@ jobs:
 #     - name: Download output
 #       uses: actions/download-artifact@v3
     - name: Download output
-      uses: dawidd6/action-download-artifact@v5
+      uses: dawidd6/action-download-artifact@v6
       with:
         github_token: ${{secrets.GITHUB_TOKEN}}
         workflow: check-outdated-content.yaml