feat(helm): update chart grafana ( 7.0.19 → 7.3.7 )

| datasource | package | from   | to    |
| ---------- | ------- | ------ | ----- |
| helm       | grafana | 7.0.19 | 7.3.7 |


Signed-off-by: Anthony Rabbito <hello@anthonyrabbito.com>

Author: renovate[bot]

k8s/base/monitoring/grafana/helm-release.yaml

@@ -11,7 +11,7 @@ spec:
   chart:
     spec:
       chart: grafana
-      version: 7.0.19
+      version: 7.3.7
       sourceRef:
         kind: HelmRepository
         name: grafana-charts