Bump dawidd6/action-download-artifact from 9 to 21

Bumps [dawidd6/action-download-artifact](https://github.com/dawidd6/action-download-artifact) from 9 to 21.
- [Release notes](https://github.com/dawidd6/action-download-artifact/releases)
- [Commits](dawidd6/action-download-artifact@v9...v21)

---
updated-dependencies:
- dependency-name: dawidd6/action-download-artifact
  dependency-version: '21'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/comment-on-pr.yml

@@ -17,7 +17,7 @@ jobs:
 
     steps:
     - name: Get the PR Number artifact
-      uses: dawidd6/action-download-artifact@v9
+      uses: dawidd6/action-download-artifact@v21
       with:
         workflow: ${{ github.event.workflow_run.workflow_id }}
         workflow_conclusion: ""
@@ -27,7 +27,7 @@ jobs:
     - name: Confirm the PR Number (Debugging)
       run: echo $PR_NUMBER
     - name: Get the code coverage results file
-      uses: dawidd6/action-download-artifact@v9
+      uses: dawidd6/action-download-artifact@v21
       with:
         workflow: ${{ github.event.workflow_run.workflow_id }}
         workflow_conclusion: ""