Update CHANGELOG for 8.60.0

[ci skip]

CHANGELOG

 # Changelog for gitlab-workhorse
 
+## v8.60.0
+
+### Added
+- Support Git HTTP on toplevel repositories
+  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/670
+- Update GoCloud to v0.21.1+
+  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/675
+
+### Changed
+- Allow blank S3 regions to be used
+  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/677
+
 ## v8.59.0
 
 ### Fixed

changelogs/unreleased/jv-git-http-routing.yml

----
-title: Support Git HTTP on toplevel repositories
-merge_request: 670
-author:
-type: added

changelogs/unreleased/sh-allow-blank-s3-region.yml

----
-title: Allow blank S3 regions to be used
-merge_request: 677
-author:
-type: changed

changelogs/unreleased/sh-update-gocloud.yml

----
-title: Update GoCloud to v0.21.1+
-merge_request: 675
-author:
-type: added