Update CHANGELOG for 8.63.0

[ci skip]

CHANGELOG

 # Changelog for gitlab-workhorse
 
+## v8.63.0
+
+### Added
+- Accept more paths as Git HTTP
+  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/684
+
+### Other
+- Migrate error tracking from raven to labkit
+  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/671
+
 ## v8.62.0
 
 ### Added

changelogs/unreleased/mk-labkit-error-tracking.yml

----
-title: Migrate error tracking from raven to labkit
-merge_request: 671
-author:
-type: other

changelogs/unreleased/toplevel-git-http-routes.yml

----
-title: Accept more paths as Git HTTP
-merge_request: 684
-author:
-type: added