Update changelog for release (#2626)

Author: jaydeluca

CHANGELOG.md

@@ -2,6 +2,25 @@
 
 ## Unreleased
 
+### Compressors
+
+- Update zstd compressor to use new Compressor SPI from SDK
+  ([#2625](https://github.com/open-telemetry/opentelemetry-java-contrib/pull/2625))
+
+### Disk buffering
+
+- Add support for complex attributes (arrays, nested structures)
+  ([#2625](https://github.com/open-telemetry/opentelemetry-java-contrib/pull/2625))
+- Fix IllegalArgumentException: Unrecognized AnyValue type on empty LogRecord.body
+  ([#2529](https://github.com/open-telemetry/opentelemetry-java-contrib/pull/2529))
+
+### Dynamic control
+
+- Add initial TelemetryPolicy
+  ([#2592](https://github.com/open-telemetry/opentelemetry-java-contrib/pull/2592))
+- Add trace sampling validation
+  ([#2604](https://github.com/open-telemetry/opentelemetry-java-contrib/pull/2604))
+
 ## Version 1.53.0 (2026-01-21)
 
 ### AWS X-Ray propagator