Bump dawidd6/action-download-artifact from 13 to 15 (#661)

Author: dependabot[bot]

.github/workflows/coverage-comment.yml

@@ -15,7 +15,7 @@ jobs:
       github.event.workflow_run.conclusion == 'success'
     steps:
     - name: Download PR comment artifact
-      uses: dawidd6/action-download-artifact@v13
+      uses: dawidd6/action-download-artifact@v15
       with:
         workflow: main.yml
         run_id: ${{ github.event.workflow_run.id }}

.github/workflows/main.yml

@@ -70,7 +70,7 @@ jobs:
         retention-days: 30
     - name: Download base branch coverage
       if: ${{ matrix.release_build && github.event_name == 'pull_request' }}
-      uses: dawidd6/action-download-artifact@v13
+      uses: dawidd6/action-download-artifact@v15
       continue-on-error: true
       with:
         workflow: main.yml