Update CHANGELOG for 8.59.0

[ci skip]

CHANGELOG

 # Changelog for gitlab-workhorse
 
+## v8.59.0
+
+### Fixed
+- Image scaling: strip out iCCP chunks in PNG files
+  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/673
+
+### Other
+- Extract logging concerns into a separate module
+  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/
+
+### Security
+- Reject unknown http methods
+  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/
+
 ## v8.58.0
 
 ### Added

changelogs/unreleased/341-skip-iccp-chunk.yml

----
-title: 'Image scaling: strip out iCCP chunks in PNG files'
-merge_request: 673
-author:
-type: fixed

changelogs/unreleased/mk-refactor-logging.yml

----
-title: Extract logging concerns into a separate module
-merge_request:
-author:
-type: other

changelogs/unreleased/security-reject-unkhown-methods.yml

----
-title: Reject unknown http methods
-merge_request:
-author:
-type: security