Automated PR created by
[helm-weekly-release-pr.yaml](https://github.com/grafana/mimir/blob/main/.github/workflows/helm-weekly-release-pr.yaml)

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Low Risk**
> Version and documentation metadata only; no deployment template or
configuration logic changes.
> 
> **Overview**
> Automated weekly bump of the **mimir-distributed** Helm chart from
`6.1.0-weekly.398` to **`6.1.0-weekly.399`**, with **`appVersion`**
updated from `r398-fa878573` to **`r399-2ef9a3d4`**.
> 
> **README.md** is aligned with the new chart version in the
documentation note and version badges. No chart templates, values, or
dependency versions change in this diff.
> 
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
69bfd356cdf434590231415895f9d0c7ab420577. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Co-authored-by: mimir-vendoring[bot] <149193068+mimir-vendoring[bot]@users.noreply.github.com>