Upgrade Grafana chart in seldon-core-analytics

[adriangonz]

Describe the bug

The current seldon-core-analytics chart uses an outdated version of the Grafana chart (5.1.4) which includes a version of sqlite (3.30.1-r1) affected by a CVE with code CVE-2020-11656. To make sure that the seldon-core-analytics chart is free of CVEs, it would be good to assess the complexity of upgrading to a newer Grafana chart (if we are able to find a version free of the CVE).

To reproduce

Expected behaviour

Environment

Model Details

• Images of your model: [Output of: kubectl get seldondeployment -n <yourmodelnamespace> <seldondepname> -o yaml | grep image: where <yourmodelnamespace>]
• Logs of your model: [You can get the logs of your model by running kubectl logs -n <yourmodelnamespace> <seldonpodname> <container>]