Update grafana/promtail Docker tag to v3

manifests/_apps/reloader.yaml

@@ -12,7 +12,7 @@ spec:
     name: cluster-fun (v2)
   source:
     repoURL: 'https://stakater.github.io/stakater-charts'
-    targetRevision: 2.2.7
+    targetRevision: v0.0.89
     chart: reloader
   syncPolicy:
     automated: {}

manifests/monitoring/promtail.yaml

@@ -216,7 +216,7 @@ spec:
       serviceAccountName: promtail
       containers:
         - name: promtail
-          image: "grafana/promtail:2.9.17"
+          image: "grafana/promtail:3.6.3"
           imagePullPolicy: IfNotPresent
           args:
             - "-config.file=/etc/promtail/promtail.yaml"