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>

Author: dependabot[bot]

.github/workflows/run-tests.yml

@@ -388,7 +388,7 @@ jobs:
           sudo df -h
 
       - name: Download build artifact
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: build-${{ matrix.distro-version }}-qt${{ matrix.qt-version }}.tgz
           path: .
@@ -489,7 +489,7 @@ jobs:
           DOCKER_IMAGE: ${{ steps.docker-build.outputs.FULL_IMAGE_NAME }}
 
       - name: Download build artifact
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: build-${{ matrix.distro-version }}-qt${{ matrix.qt-version }}.tgz
           path: .