Merge pull request #1166 from lsst-it/renovate/cert-manager-1.x

Update Helm release cert-manager to v1.19.1

Author: jhoblitt

fleet/lib/cert-manager/fleet.yaml

@@ -8,7 +8,7 @@ helm:
   chart: *name
   releaseName: *name
   repo: https://charts.jetstack.io
-  version: v1.18.2
+  version: v1.19.1
   values:
     installCRDs: false
     prometheus: