Bump actions/download-artifact from 4 to 5 (#16884)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 4 to 5.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v4...v5)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/build-test.yml

@@ -823,7 +823,7 @@ jobs:
         run: npm i -g npm@${{env.NPM_VERSION}}
 
       - name: Download VSIX
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v5
         with:
           name: 'ms-toolsai-jupyter-insiders.vsix'