Update CHANGELOG for 8.34.0

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CHANGELOG

 # Changelog for gitlab-workhorse
 
+## v8.34.0
+
+### Added
+- Support Workhorse directly uploading files to S3
+  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/466
+
+### Fixed
+- Disable compression for open archive
+  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/508
+  Contributed by Georges-Etienne Legendre
+
+### Other
+- Add configuration to support an S3 client inside Workhorse
+  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/516
+- Refactor Preparer and SaveFileOpts handling
+  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/515
+
 ## v8.33.0
 
 ### Added

changelogs/unreleased/fix-issue-264.yml

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

changelogs/unreleased/sh-refactor-upload-preparers.yml

----
-title: Refactor Preparer and SaveFileOpts handling
-merge_request: 515
-author:
-type: other

changelogs/unreleased/sh-workhorse-direct-s3-config-support.yml

----
-title: Add configuration to support an S3 client inside Workhorse
-merge_request: 516
-author:
-type: other

changelogs/unreleased/sh-workhorse-direct-s3.yml

----
-title: Support Workhorse directly uploading files to S3
-merge_request: 466
-author:
-type: added