Merge pull request #1160 from lsst-it/renovate/k8up-4.x

Update Helm release k8up to v4.8.6

Author: jhoblitt

fleet/lib/k8up/fleet.yaml

@@ -16,7 +16,7 @@ helm:
   chart: *name
   releaseName: *name
   repo: https://k8up-io.github.io/k8up
-  version: 4.8.5
+  version: 4.8.6
   timeoutSeconds: 60
   waitForJobs: true
 targetCustomizations: