[Post release] release-2.9.2: update changelog (#10918)

**What this PR does / why we need it**:
Update the changelog on main to reflect 2.9.2 changes

**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](d10549e3ec)

CHANGELOG.md

@@ -69,7 +69,14 @@
 
 * [10784](https://github.com/grafana/loki/pull/10894) **slim-bean** Update index gateway client to use a headless service.
 
+## 2.9.2 (2023-10-16)
 
+### All Changes
+
+##### Security
+
+* [10879](https://github.com/grafana/loki/pull/10879) **DylanGuedes**: Upgrade golang.org/x/net to v0.17.0 to patch CVE-2023-39325 / CVE-2023-44487
+* [10871](https://github.com/grafana/loki/pull/10871) **ashwanthgoli**: Upgrade go to v1.21.3 and grpc-go to v1.56.3 to patch CVE-2023-39325 / CVE-2023-44487
 
 ## 2.9.1 (2023-09-14)