Bump actions/download-artifact from 3 to 4.1.7 in /.github/workflows

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 3 to 4.1.7.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v3...v4.1.7)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-type: direct:production
...

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

Author: dependabot[bot]

.github/workflows/build.yml

@@ -78,7 +78,7 @@ jobs:
       with:
         python-version: '3.9'
         architecture: 'x64'
-    - uses: actions/download-artifact@v3
+    - uses: actions/download-artifact@v4.1.7
       with:
         name: extension-artifacts
     - name: Install and Test
@@ -114,7 +114,7 @@ jobs:
       uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
 
     - name: Download extension package
-      uses: actions/download-artifact@v3
+      uses: actions/download-artifact@v4.1.7
       with:
         name: extension-artifacts