build(deps): bump actions/download-artifact from 5 to 6

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 5 to 6.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](https://github.com/actions/download-artifact/compare/v5...v6)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/build.yml

@@ -516,7 +516,7 @@ jobs:
         uses: actions/checkout@v5
       -
         name: Download binaries
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           path: ${{ env.DESTDIR }}
           pattern: buildx-*

.github/workflows/e2e.yml

@@ -118,7 +118,7 @@ jobs:
         if: matrix.driver == 'docker' || matrix.driver == 'docker-container'
       -
         name: Install buildx
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: binary
           path: /home/runner/.docker/cli-plugins
@@ -230,7 +230,7 @@ jobs:
         uses: docker/setup-qemu-action@v3
       -
         name: Install buildx
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: binary
           path: /home/runner/.docker/cli-plugins