deploy mo-ob-opensource 1.0.2 beta (#14)

## What type of PR is this?

* [ ] Feature
* [x] BUG
* [ ] Alerts
* [ ] Improvement
* [ ] Documentation
* [ ] Test and CI

## Which issue(s) this PR related:

issue # none

## What this PR does / why we need it:
changes:
1. update loki-chart 6.3.4 -> 6.4.1, which fix the backend/read replica
setting
2. deploy mo-ob-opensource-1.0.2-beta

preview
`git diff --stat helm-loki-6.3.4 helm-loki-6.4.1  production/helm/loki`

![image](https://github.com/matrixone-cloud/observability-charts/assets/3927687/c2780570-82e7-466f-89ce-0097e4210264)

Author: xzxiong

charts/mo-ob-opensource/Chart.yaml

@@ -2,7 +2,7 @@ apiVersion: v2
 name: mo-ob-opensource
 description: mo-ob-opensource's Helm chart for Kubernetes
 type: application
-version: 1.0.2-alpha
+version: 1.0.2-beta
 appVersion: 0.9.0
 dependencies:
 - condition: kube-prometheus-stack.enabled
@@ -12,7 +12,7 @@ dependencies:
 - condition: loki.enabled
   name: loki
   repository: https://grafana.github.io/helm-charts
-  version: 6.3.4
+  version: 6.4.1
 - condition: promtail.enabled
   name: promtail
   repository: https://grafana.github.io/helm-charts