Update changelog for 5.8.2 release

CHANGELOG.md

@@ -7,10 +7,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 This changelog format was introduced in NAV 5.4.0. Older changelogs can be
 found in the [HISTORY](HISTORY) file.
 
-## [Unreleased]
+## [5.8.2] - 2023-11-30
 
 ### Fixed
 
+- Fix broken "operate as user" function in User and API Administration tool ([#2766](https://github.com/Uninett/nav/issues/2766), [#2777](https://github.com/Uninett/nav/pull/2777))
 - Fix crashing PDU widget ([#2776](https://github.com/Uninett/nav/pull/2776))
 - Fix bug that caused PortAdmin to stop working for Cisco switches ([#2773](https://github.com/Uninett/nav/issues/2773), ([#2774](https://github.com/Uninett/nav/pull/2774))