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]>

.github/workflows/mulle-sde-artifacts.yml

@@ -50,7 +50,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Download Linux Artifact
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4.1.7
         with:
           name: artifact.Linux
           # actual file will be ${{ steps.executable.outputs.exepath }} though!
@@ -60,7 +60,7 @@ jobs:
              mv ${{ github.workspace }}/${{ github.event.repository.name }} ${{ github.workspace }}/${{ github.event.repository.name }}.linux
 
       - name: Download macOS Artifact
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4.1.7
         with:
           name: artifact.macOS