chore: update changelog for version 2.16.4 (#11463)

- [x] update changelog for version 2.16.4

---------

Co-authored-by: erikayasuda <[email protected]>

Author: apiarian-datadog

CHANGELOG.md

@@ -2,6 +2,18 @@
 
 Changelogs for versions not listed here can be found at https://github.com/DataDog/dd-trace-py/releases
 
+---
+
+## 2.16.4
+
+
+### Bug Fixes
+
+- Tracing
+  - botocore: Resolves the issue where the span pointer for deserialized DynamoDB requests (through the resource-based API) were not being generated.
+  - botocore: Resolves an issue where our span pointer calculation code added recently logged unactionable messages.
+
+
 ---
 
 ## 2.16.2