…r) (#10483)

**Here is a summary of the updates contained in this PR:**
***
Update attribute `$.appVersion` in yaml file
`./production/helm/loki/Chart.yaml` to the following value: `2.9.0`
***
Bump version of Helm Chart
Add changelog entry to `./production/helm/loki/CHANGELOG.md`
Re-generate docs

Co-authored-by: Kaviraj Kanagaraj <kavirajkanagaraj@gmail.com>