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-version: '6'
  dependency-type: direct:production
...

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

Author: dependabot[bot]

.github/workflows/test-brev-tutorial-docker-images.yml

@@ -46,7 +46,7 @@ jobs:
           echo "GIT_SHORT_SHA=${GIT_SHORT_SHA}" >> $GITHUB_ENV
 
       - name: Download commit-specific Docker Compose artifact
-        uses: dawidd6/action-download-artifact@v2
+        uses: dawidd6/action-download-artifact@v6
         with:
           workflow: build-brev-tutorial-docker-images.yml
           run_id: ${{ inputs.workflow_run_id }}