Bump dawidd6/action-download-artifact from 3 to 6 in /.github/workflows

Bumps [dawidd6/action-download-artifact](https://github.com/dawidd6/action-download-artifact) from 3 to 6.
- [Release notes](https://github.com/dawidd6/action-download-artifact/releases)
- [Commits](dawidd6/action-download-artifact@v3...v6)

---
updated-dependencies:
- dependency-name: dawidd6/action-download-artifact
  dependency-type: direct:production
...

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

.github/workflows/automatic.yml

@@ -84,7 +84,7 @@ jobs:
 
       - name: download tfplan
         if: github.event.pull_request.merged == true
-        uses: dawidd6/action-download-artifact@v3
+        uses: dawidd6/action-download-artifact@v6
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           name: tfplan