chore: changelog (#6635)

CHANGELOG.md

@@ -41,6 +41,13 @@ Canonical reference for changes, improvements, and bugfixes for Boundary.
 * Removed the error log during RDP basic settings exchange: When you connect to
   an RDP target using the built-in Windows Remote Desktop Connection app. ([PR](https://github.com/hashicorp/boundary/pull/6136))
 
+## 0.20.3 (2026/04/24)
+
+### Security
+
+* Updated jackc/pgx/v5 dependency to v5.9.2 to address GHSA-j88v-2chj-qfwx, GO-2026-4771, GO-2026-4772, and GHSA-9jj7-4m8r-rfcm ([PR](https://github.com/hashicorp/boundary/pull/6607), [PR](https://github.com/hashicorp/boundary/pull/6617))
+* Updated Azure/go-ntlmssp dependency to v0.1.1 to address GHSA-pjcq-xvwq-hhpj ([PR](https://github.com/hashicorp/boundary/pull/6625))
+
 ## 0.20.2 (2026/02/10)
 
 ### Security