Bump dawidd6/action-download-artifact from 2 to 6 in /.github/workflows

Bumps [dawidd6/action-download-artifact](https://github.com/dawidd6/action-download-artifact) from 2 to 6.
- [Release notes](https://github.com/dawidd6/action-download-artifact/releases)
- [Commits](dawidd6/action-download-artifact@v2...v6)

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

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

.github/workflows/docker.yml

@@ -23,7 +23,7 @@ jobs:
       with:
         version: 3.x
         repo-token: ${{ secrets.GITHUB_TOKEN }}
-    - uses: dawidd6/action-download-artifact@v2
+    - uses: dawidd6/action-download-artifact@v6
       with:
         github_token: ${{ secrets.GITHUB_TOKEN }}
         workflow: build.yml