2.13: add changelog entry for updated dep (#8656)

XXX was merged and we will include it in a future patch release since it's only with low severity. But adding a changelog entry now so we don't forget later on

Signed-off-by: Dimitar Dimitrov <dimitar.dimitrov@grafana.com>

CHANGELOG.md

@@ -104,6 +104,7 @@
 * [BUGFIX] Alertmanager: Fix per-tenant silence limits not reloaded during runtime. #8456
 * [BUGFIX] Alertmanager: Fix help message for utf-8-strict-mode. #8572
 * [BUGFIX] Upgrade golang to 1.22.5 to address [CVE-2024-24791](https://nvd.nist.gov/vuln/detail/CVE-2024-24791). #8600
+* [BUGFIX] Upgrade github.com/rs/cors to v1.11.0 address [GHSA-mh55-gqvf-xfwm](https://github.com/advisories/GHSA-mh55-gqvf-xfwm). #8611
 
 ### Mixin