chore(deps): bump actions/download-artifact from 5 to 6 (#3321)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 5 to 6.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/e2e.yaml

@@ -132,12 +132,12 @@ jobs:
           echo "KUBECONFIG env var: ${KUBECONFIG}"
 
       - name: Download vcluster cli
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: vcluster
 
       - name: Download syncer image
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: vcluster_syncer
 
@@ -209,18 +209,18 @@ jobs:
           echo "KUBECONFIG env var: ${KUBECONFIG}"
 
       - name: Download vcluster cli
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: vcluster
           path: vcluster-dev
 
       - name: Download current cli
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: vcluster-current
 
       - name: Download syncer image
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: vcluster_syncer
 
@@ -341,12 +341,12 @@ jobs:
           kubectl wait --for=condition=Available -n kube-system deploy/snapshot-controller --timeout=60s
 
       - name: Download vcluster cli
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: vcluster
 
       - name: Download syncer image
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: vcluster_syncer