Update CHANGELOG for 8.45.0

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CHANGELOG

 # Changelog for gitlab-workhorse
 
+## v8.45.0
+
+### Added
+- Reject upload when filesize exceeds MaximumSize returned by authorize endpoint
+  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/
+
+### Other
+- Eliminate unnecessary code in GoCloud test stubs
+  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/590
+- Drop tests that check for log messages
+  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/591
+
 ## v8.44.0
 
 ### Fixed

changelogs/unreleased/authorize-upload-filesize.yml

----
-title: Reject upload when filesize exceeds MaximumSize returned by authorize endpoint
-merge_request:
-author:
-type: added

changelogs/unreleased/sh-fix-gocloud-race.yml

----
-title: Eliminate unnecessary code in GoCloud test stubs
-merge_request: 590
-author:
-type: other

changelogs/unreleased/sh-remove-log-tests.yml

----
-title: Drop tests that check for log messages
-merge_request: 591
-author:
-type: other