bug: bump prometheus chart version from 8.8.2 to 8.8.4

This fixes a bug where a resource name had quotation marks embedded in
the name, making it invalid and a configmap was named differently than
the volume reference.

addons/prometheus/0.35.x/prometheus-2.yaml

@@ -10,7 +10,7 @@ metadata:
     # on the cluster, this hack will trigger re-queue on Addons until one exists.
     kubeaddons.mesosphere.io/hack-requires-defaultstorageclass: "true"
   annotations:
-    catalog.kubeaddons.mesosphere.io/addon-revision: "0.35.0-1"
+    catalog.kubeaddons.mesosphere.io/addon-revision: "0.35.0-2"
     appversion.kubeaddons.mesosphere.io/prometheus-operator: "0.35.0"
     appversion.kubeaddons.mesosphere.io/prometheus: "2.15.2"
     appversion.kubeaddons.mesosphere.io/alertmanager: "0.20.0"
@@ -42,7 +42,7 @@ spec:
   chartReference:
     chart: prometheus-operator
     repo: https://mesosphere.github.io/charts/staging
-    version: 8.8.2
+    version: 8.8.4
     values: |
       ---
       defaultRules: