chore: update CHANGELOG for #955

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: brendan-kellam

CHANGELOG.md

@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Changed
+- Bumped `@aws-sdk/credential-providers` to `^3.1000.0`. [#955](https://github.com/sourcebot-dev/sourcebot/pull/955)
+
 ## [4.13.0] - 2026-02-27
 
 ### Added