Update CHANGELOG for 8.52.0

[ci skip]

CHANGELOG

 # Changelog for gitlab-workhorse
 
+## v8.52.0
+
+### Fixed
+- Only generate CI artifact metadata for ZIP files
+  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/627
+- Fix typo in redis URL scheme
+  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/631
+- Restructure error handling in main()
+  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/633
+
+### Other
+- Include route regex identifier in structured logs
+  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/624
+
 ## v8.51.0
 
 ### Changed

changelogs/unreleased/fix-typo-in-url-scheme.yml

----
-title: Fix typo in redis URL scheme
-merge_request: 631
-author:
-type: fixed

changelogs/unreleased/include-route-field-in-logs.yml

----
-title: Include route regex identifier in structured logs
-merge_request: 624
-author:
-type: other

changelogs/unreleased/jv-startup-errors.yml

----
-title: Restructure error handling in main()
-merge_request: 633
-author:
-type: fixed

changelogs/unreleased/sh-fix-zip-metadata-warnings.yml

----
-title: Only generate CI artifact metadata for ZIP files
-merge_request: 627
-author:
-type: fixed