[release-2.9.x] [release-2.9.x] add release notes for 2.9.2 (#10913)

Backport d47a189 from #10911

---

**What this PR does / why we need it**:

**Which issue(s) this PR fixes**:
Fixes #<issue number>

**Special notes for your reviewer**:

**Checklist**
- [ ] Reviewed the
[`CONTRIBUTING.md`](https://github.com/grafana/loki/blob/main/CONTRIBUTING.md)
guide (**required**)
- [ ] Documentation added
- [ ] Tests updated
- [ ] `CHANGELOG.md` updated
- [ ] If the change is worth mentioning in the release notes, add
`add-to-release-notes` label
- [ ] Changes that require user attention or interaction to upgrade are
documented in `docs/sources/setup/upgrade/_index.md`
- [ ] For Helm chart changes bump the Helm chart version in
`production/helm/loki/Chart.yaml` and update
`production/helm/loki/CHANGELOG.md` and
`production/helm/loki/README.md`. [Example
PR](d10549e)

Co-authored-by: Ashwanth <iamashwanth@gmail.com>

docs/sources/release-notes/v2-9.md

@@ -37,5 +37,8 @@ Grafana Labs is excited to announce the release of Loki 2.9.0 Here's a summary o
 * Update Docker base images to mitigate security vulnerability CVE-2022-48174
 * Fix bugs in indexshipper (`tsdb`, `boltdb-shipper`) that could result in not showing all ingested logs in query results.
 
+### 2.9.2 (2023-10-16)
+
+* Upgrade go to v1.21.3, golang.org/x/net to v0.17.0 and grpc-go to v1.56.3 to patch CVE-2023-39325 / CVE-2023-44487
 
 For a full list of all changes and fixes, look at the [CHANGELOG](https://github.com/grafana/loki/blob/release-2.9.x/CHANGELOG.md).