chore(deps): bump actions/download-artifact from 4 to 6

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 4 to 6.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v4...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]>

Author: dependabot[bot]

.github/workflows/openshift-preflight.yml

@@ -73,7 +73,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Download Preflight Binary
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: preflight-binary
           path: .

.github/workflows/release.yml

@@ -96,7 +96,7 @@ jobs:
 
       # Ensure the chart is here to be embedded in the CLI
       - name: Download packaged chart artifact
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v6
         with:
           name: odigos-chart
           path: cli/pkg/helm/embedded
@@ -273,7 +273,7 @@ jobs:
           version: v3.15.2
 
       - name: Download packaged chart artifact
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v6
         with:
           name: odigos-chart
           path: helm/