chore(deps): bump kumactl install demo|observability container images

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

app/kumactl/data/install/k8s/metrics/grafana/grafana.yaml

@@ -265,7 +265,7 @@ spec:
               mountPath: /var/lib/grafana/plugins
       containers:
         - name: grafana
-          image: "grafana/grafana:12.1.1@sha256:a1701c2180249361737a99a01bc770db39381640e4d631825d38ff4535efa47d"
+          image: "grafana/grafana:12.2.0@sha256:74144189b38447facf737dfd0f3906e42e0776212bf575dc3334c3609183adf7"
           imagePullPolicy: IfNotPresent
           volumeMounts:
             - name: config

app/kumactl/data/install/k8s/metrics/prometheus/server.yaml

@@ -435,7 +435,7 @@ spec:
               mountPath: /etc/config
               readOnly: true
         - name: prometheus-server
-          image: "prom/prometheus:v3.5.0@sha256:63805ebb8d2b3920190daf1cb14a60871b16fd38bed42b857a3182bc621f4996"
+          image: "prom/prometheus:v3.6.0@sha256:76947e7ef22f8a698fc638f706685909be425dbe09bd7a2cd7aca849f79b5f64"
           imagePullPolicy: "IfNotPresent"
           args:
             - --config.file=/etc/config/prometheus.yml