fix pr number in changelog

Signed-off-by: Friedrich Gonzalez <friedrichg@gmail.com>

CHANGELOG.md

@@ -1,7 +1,7 @@
 # Changelog
 
 ## master / unreleased
-* [CHANGE] Alertmanager: Local file disclosure vulnerability in OpsGenie configuration has been fixed. #11
+* [CHANGE] Alertmanager: Local file disclosure vulnerability in OpsGenie configuration has been fixed. #5045
 * [ENHANCEMENT] Update Go version to 1.19.3. #4988
 * [ENHANCEMENT] Querier: limit series query to only ingesters if `start` param is not specified. #4976
 * [ENHANCEMENT] Query-frontend/scheduler: add a new limit `frontend.max-outstanding-requests-per-tenant` for configuring queue size per tenant. Started deprecating two flags `-query-scheduler.max-outstanding-requests-per-tenant` and `-querier.max-outstanding-requests-per-tenant`, and change their value default to 0. Now if both the old flag and new flag are specified, the old flag's queue size will be picked. #5005