Update changelog for 0.27.3 (#1272)

Author: dopey

CHANGELOG.md

@@ -26,6 +26,22 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ---
 
+## [0.27.3] - 2024-09-13
+
+### Added
+
+- Support for signing and publishing RPM and Deb packages to GCP Artifact Registry (smallstep/cli#1246)
+
+### Changed
+
+- Update Release download URLs for RPM and DEB packages with new file name formats (smallstep/cli#1256)
+
+### Fixed
+
+- Parse crlEntryExtensions in CRLs (smallstep/cli#1262)
+- PowerShell 5.1 CLI crashes in Windows 11 (smallstep/cli#1257)
+
+
 ## [0.27.2] - 2024-07-18
 
 ### Added