chore(deps): bump actions/download-artifact from 4 to 5

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 4 to 5.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v4...v5)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/e2e.yaml

@@ -79,11 +79,11 @@ jobs:
         go-version-file: go.mod
       id: go
     - name: Download prebuilt konnectivity-server image
-      uses: actions/download-artifact@v4
+      uses: actions/download-artifact@v5
       with:
         name: konnectivity-server
     - name: Download prebuilt konnectivity-agent image
-      uses: actions/download-artifact@v4
+      uses: actions/download-artifact@v5
       with:
         name: konnectivity-agent
     - name: Load prebuilt konnectivity images
@@ -187,11 +187,11 @@ jobs:
         # dump the kubeconfig for later
         /usr/local/bin/kind get kubeconfig --name ${{ env.KIND_CLUSTER_NAME}} > _artifacts/kubeconfig.conf
 
-    - uses: actions/download-artifact@v4
+    - uses: actions/download-artifact@v5
       with:
         name: konnectivity-server
 
-    - uses: actions/download-artifact@v4
+    - uses: actions/download-artifact@v5
       with:
         name: konnectivity-agent