…r) (#8923)

**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: `2.7.5`
***
Bump version of Helm Chart
Add changelog entry to `./production/helm/loki/CHANGELOG.md`
Re-generate docs

Co-authored-by: Michel Hollands <42814411+MichelHollands@users.noreply.github.com>