Update CHANGELOG for 8.30.3

[ci skip]

CHANGELOG

 # Changelog for gitlab-workhorse
 
+## v8.30.3
+
+### Fixed
+- Disable compression for open archive
+  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/508
+  Contributed by Georges-Etienne Legendre
+- Fix Content-Length set prior to SendUrl injection
+  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/496
+  Contributed by Georges-Etienne Legendre
+
+### Other
+- Add automatic changelog generation
+  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/484
+
 v 8.30.2
 
 - Limit memory footprint of a command that generates ZIP artifacts metadata

changelogs/unreleased/changelog-generator.yml

----
-title: Add automatic changelog generation
-merge_request: 484
-author:
-type: other

changelogs/unreleased/fix-content-length-missing.yml

----
-title: Fix Content-Length set prior to SendUrl injection
-merge_request: 496
-author: Georges-Etienne Legendre
-type: fixed

changelogs/unreleased/fix-issue-264.yml

----
-title: Disable compression for open archive
-merge_request: 508
-author: Georges-Etienne Legendre
-type: fixed