Fix 1.3.0 release notes (#5202)

Author: AgnesToulet

release notes/v1.3.0.md

@@ -210,7 +210,6 @@ Thank you, @HasithDeAlwis, for contributing this feature.
 
 ## UX improvements and enhancements
 
-- [#5164](https://github.com/grafana/k6/pull/5164) Rate metrics are now exported as a single counter with a label that can have two values: zero and nonzero.
 - [#5117](https://github.com/grafana/k6/pull/5117) Unifies unauthenticated errors for Cloud commands.
 - [#5125](https://github.com/grafana/k6/pull/5125) Changes a warn log to a debug when a worker type is used on a website under test.
 - [#5111](https://github.com/grafana/k6/pull/5111) Adds retries to actionability based APIs (`locator`) when elements aren't visible.