Update CHANGELOG for 8.49.0

[ci skip]

CHANGELOG

 # Changelog for gitlab-workhorse
 
+## v8.49.0
+
+### Fixed
+- Fix gitlab-resize-image bin installation
+  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/618
+
+### Other
+- Add image scaler duration histogram
+  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/614
+- Pass CORRELATION_ID env variable to resize image subprocesses
+  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/612
+- Simplify s3 session management code
+  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/616
+- Bump labkit dependency to get mutex profiling
+  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/
+
 ## v8.48.0
 
 ### Changed

changelogs/unreleased/alipniagov-fix-image-resizing-binary-install.yml

----
-title: Fix gitlab-resize-image bin installation
-merge_request: 618
-author:
-type: fixed

changelogs/unreleased/bump-labkit.yml

----
-title: Bump labkit dependency to get mutex profiling
-merge_request:
-author:
-type: other

changelogs/unreleased/image-resizer-correlation-id.yml

----
-title: Pass CORRELATION_ID env variable to resize image subprocesses
-merge_request: 612
-author:
-type: other

changelogs/unreleased/jv-simplify-s3-sessions.yml

----
-title: Simplify s3 session management code
-merge_request: 616
-author:
-type: other

changelogs/unreleased/mk-more-image-scaler-prometheus-metrics.yml

----
-title: Add image scaler duration histogram
-merge_request: 614
-author:
-type: other