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](https://github.com/actions/download-artifact/compare/v3...v4.1.7)

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

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/build.yml

@@ -81,7 +81,7 @@ jobs:
     steps:
       - name: Obtain apk from artifact
         id: download
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4.1.7
         with:
           name: vector-gplay-release-unsigned
       - name: Show apks in artifact