docs: fix category in the CHANGELOG

https://keepachangelog.com/en/1.0.0/

CHANGELOG.md

@@ -5,8 +5,10 @@ This is the changelog for SpotBugs. This follows [Keep a Changelog v1.0.0](http:
 Currently the versioning policy of this project follows [Semantic Versioning v2.0.0](http://semver.org/spec/v2.0.0.html).
 
 ## 4.5.2 - 2021-12-13
-### Fixed
+### Security
 - Bumped log4j from 2.14.1 to 2.15.0 to address CVE-2021-44228
+
+### Fixed
 - Updated RV_01_TO_INT to handle float and long checks ([#1518](https://github.com/spotbugs/spotbugs/issues/1518))
 
 ## 4.5.1 - 2021-12-08