Bug: Issue with Mounting Certificate from ConfigMap in Grafana

#### Problem
We need to mount a certificate from a ConfigMap. However, in the currently used Grafana version, an empty directory is mounted instead.

#### Analysis
The issue seems to be caused by the Grafana version being a bit older. Specifically, the problem originates from this [line of code](https://github.com/apache/incubator-devlake-helm-chart/blob/5182bb4ed8dc6152d97054213f61cc07134bcd37/charts/devlake/charts/grafana/templates/_pod.tpl#L1137):

```yaml
{{- range .Values.extraVolumeMounts }}
# It should instead use
{{- range .Values.extraVolumes }}
```

This issue appears to have been addressed in [this issue](https://github.com/prometheus-community/helm-charts/issues/3851) in the grafana community Helm charts.

#### Solution
We have two potential solutions to address this:

- Fix the issue in the current Grafana version by modifying the template.
- Upgrade to a newer Grafana version where this issue has already been resolved.

Would you prefer a fix in the current version or an update to a fixed version?