workflows/release-tasks: Fix release note artifact upload (llvm#69522)

(cherry picked from commit afdad4f)

Author: tstellar

.github/workflows/release-tasks.yml

@@ -50,7 +50,7 @@ jobs:
           ./llvm/utils/release/github-upload-release.py --token ${{ github.token }} --release ${{ steps.validate-tag.outputs.release-version }} upload --files *doxygen*.tar.xz
 
       - name: Create Release Notes Artifact
-        uses: actions/download-artifact@v3
+        uses: actions/upload-artifact@v3
         with:
           name: release-notes
           path: docs-build/html-export/