Updated community installer to use grafana 8.1.1 and prometheus v2.28.1

Change-Id: If64a82ccd300a512e69156101ee413377aaa8f1b
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/installers/docker/osm_pods/grafana.yaml b/installers/docker/osm_pods/grafana.yaml
index 34b445d..00e46df 100644
--- a/installers/docker/osm_pods/grafana.yaml
+++ b/installers/docker/osm_pods/grafana.yaml
@@ -154,7 +154,7 @@
           value: both
         - name: NAMESPACE
           value: monitoring
-        image: kiwigrid/k8s-sidecar:0.1.20
+        image: kiwigrid/k8s-sidecar:1.15.6
         imagePullPolicy: IfNotPresent
         name: grafana-sc-dashboard
         resources: {}
@@ -176,7 +176,7 @@
             secretKeyRef:
               key: admin-password
               name: grafana
-        image: grafana/grafana:6.3.5
+        image: grafana/grafana:8.1.1
         imagePullPolicy: IfNotPresent
         livenessProbe:
           failureThreshold: 10
@@ -234,7 +234,7 @@
           value: /etc/grafana/provisioning/datasources
         - name: RESOURCE
           value: both
-        image: kiwigrid/k8s-sidecar:0.1.20
+        image: kiwigrid/k8s-sidecar:1.15.6
         imagePullPolicy: IfNotPresent
         name: grafana-sc-datasources
         resources: {}