Bump actions/download-artifact from 5 to 6 (#3689)

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>
Upstream-repository: operator-lifecycle-manager
Upstream-commit: 2dac48906bbd2ebd9b841fc8b98774e97d1d4d20

Author: dependabot[bot]

staging/operator-lifecycle-manager/.github/workflows/e2e-tests.yml

@@ -56,7 +56,7 @@ jobs:
 
       # load the olm image
       - name: Load OLM Docker image
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: olm-image.tar
           path: .
@@ -143,7 +143,7 @@ jobs:
 
       # load the olm image
       - name: Load OLM Docker image
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: olm-image.tar
           path: .