Add changelog

Author: xrmx

CHANGELOG.md

@@ -23,6 +23,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Fix intermittent `Core Contrib Test` CI failures caused by GitHub git CDN SHA propagation lag by installing core packages from the already-checked-out local copy instead of a second git clone
   ([#4305](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/4305))
 
+### Breaking changes
+
+- `opentelemetry-instrumentation-boto`: Remove instrumentation
+  ([#4303](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/4303))
+
 ## Version 1.40.0/0.61b0 (2026-03-04)
 
 ### Added