Bump actions/download-artifact from 3 to 4

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v3...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

@@ -143,7 +143,7 @@ jobs:
           python-version: ${{ matrix.python }}
           architecture: 'x64'
           allow-prereleases: true
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           name: notebook-dist-${{ github.run_number }}
           path: ./dist

.github/workflows/playwright-update.yml

@@ -45,7 +45,7 @@ jobs:
       - name: Build
         uses: ./.github/actions/build-dist
 
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           name: notebook-dist-${{ github.run_number }}
           path: ./dist

.github/workflows/ui-tests.yml

@@ -39,7 +39,7 @@ jobs:
       - name: Base Setup
         uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
 
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           name: notebook-dist-${{ github.run_number }}
           path: ./dist