github: fix code cover publish workflow

The `upload-artifact` action in code-cover-gen was updated and the download side
no longer works. Switch to using `download-artifact`.

.github/workflows/code-cover-publish.yaml

@@ -7,7 +7,7 @@ on:
 
 
 jobs:
-  # This job downloads the artifacts genearted by the code-cover-gen job and
+  # This job downloads the artifacts generated by the code-cover-gen job and
   # uploads them to a GCS bucket, from where Reviewable can access them.
   code-cover-publish:
     runs-on: ubuntu-latest
@@ -16,29 +16,12 @@ jobs:
       github.event.workflow_run.conclusion == 'success'
     steps:
       - name: 'Download artifact'
-        uses: actions/[email protected]
+        uses: actions/download-artifact@v4
         with:
-          script: |
-            var artifacts = await github.actions.listWorkflowRunArtifacts({
-               owner: context.repo.owner,
-               repo: context.repo.repo,
-               run_id: ${{github.event.workflow_run.id }},
-            });
-            var matchArtifact = artifacts.data.artifacts.filter((artifact) => {
-              return artifact.name == "cover"
-            })[0];
-            var download = await github.actions.downloadArtifact({
-               owner: context.repo.owner,
-               repo: context.repo.repo,
-               artifact_id: matchArtifact.id,
-               archive_format: 'zip',
-            });
-            var fs = require('fs');
-            fs.writeFileSync('${{github.workspace}}/cover.zip', Buffer.from(download.data));
-
-      - run: |
-          mkdir -p cover
-          unzip cover.zip -d cover
+          name: cover
+          path: cover
+          github-token: ${{ github.token }}
+          run-id: ${{ github.event.workflow_run.id }}
 
       - name: 'Authenticate to Google Cloud'
         uses: 'google-github-actions/auth@v1'