build(deps): bump actions/download-artifact 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/flatpak.yml

@@ -72,7 +72,7 @@ jobs:
         platforms: arm64
 
     - name: Restore flatpak-builder
-      uses: actions/download-artifact@v3
+      uses: actions/download-artifact@v4.1.7
       with:
         name: flatpak-builder-${{ matrix.arch }}
 
@@ -129,7 +129,7 @@ jobs:
         platforms: arm64
 
     - name: Restore flatpak-builder
-      uses: actions/download-artifact@v3
+      uses: actions/download-artifact@v4.1.7
       with:
         name: flatpak-builder-${{ matrix.arch }}