Update CHANGELOG for 8.44.0

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CHANGELOG

 # Changelog for gitlab-workhorse
 
+## v8.44.0
+
+### Fixed
+- Fix objectstore.uploader.uploadError race
+  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/583
+- Silence errors when Azure objects have aleady been deleted
+  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/585
+- Fix race condition in httprs test
+  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/584
+
+### Performance
+- Remove an in-memory buffer for LSIF transformation
+  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/586
+
 ## v8.43.0
 
 ### Changed

changelogs/unreleased/284-remove-zip-buffer.yml

----
-title: Remove an in-memory buffer for LSIF transformation
-merge_request: 586
-author:
-type: performance

changelogs/unreleased/jv-fix-uploader-race.yml

----
-title: Fix objectstore.uploader.uploadError race
-merge_request: 583
-author:
-type: fixed

changelogs/unreleased/sh-fix-httprs-race-condition.yml

----
-title: Fix race condition in httprs test
-merge_request: 584
-author:
-type: fixed

changelogs/unreleased/sh-silence-gocloud-404-deletions.yml

----
-title: Silence errors when Azure objects have aleady been deleted
-merge_request: 585
-author:
-type: fixed