chore: Updated changelog

Signed-off-by: Steve Hipwell <[email protected]>

Author: stevehipwell

CHANGELOG.md

@@ -14,6 +14,10 @@
 
 ## [UNRELEASED]
 
+### Changed
+
+- Updated [Ruby](https://hub.docker.com/_/ruby) OCI image from `v3.3.2` to [`v3.3.3`](https://github.com/ruby/ruby/releases/tag/v3_3_3). ([#312](https://github.com/stevehipwell/fluentd-aggregator/pull/312)) _@dependabot_
+
 ## [v2.16.0] - 2024-06-10
 
 ### Changed