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] <support@github.com>

.github/workflows/build.yml

@@ -93,7 +93,7 @@ jobs:
       with:
         python-version: '3.8'
         architecture: 'x64'
-    - uses: actions/download-artifact@v2
+    - uses: actions/download-artifact@v4
       with:
         name: my_server_extension-sdist
     - name: Install and Test