Bump actions/download-artifact from 2 to 4

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 2 to 4.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v2...v4)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/build-canary.yml

@@ -50,7 +50,7 @@ jobs:
         env:
           OP_SERVICE_ACCOUNT_TOKEN: ${{ secrets.OP_SERVICE_ACCOUNT_TOKEN_PUBLIC }}
           VSS_NUGET_EXTERNAL_FEED_ENDPOINTS_PUBLIC_CANARY: "op://GitHubActionsPublic/VSS_NUGET_EXTERNAL_FEED_ENDPOINTS_PUBLIC_CANARY/credential"
-      - uses: actions/download-artifact@v2
+      - uses: actions/download-artifact@v4
       # Upload to NuGet
       - run: echo "VSS_NUGET_EXTERNAL_FEED_ENDPOINTS=${FEED_ENDPOINTS}" >> $GITHUB_ENV
         env: