chore: bump actions/upload-artifact from 6 to 7 (kubefleet-dev#470)

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -167,7 +167,7 @@ jobs:
 
       - name: Upload logs
         if: always()
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: e2e-logs-${{ matrix.customized-settings }}
           path: test/e2e/logs-${{ matrix.customized-settings }}/