Update CHANGELOG for v0.27.3 (#1992)

* Update CHANGELOG for v0.27.3

Co-authored-by: Herman Slatman <[email protected]>

CHANGELOG.md

@@ -25,6 +25,24 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
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+## [0.27.3] - 2024-09-13
+
+### Added
+
+- AWS auth method for Vault RA mode (smallstep/certificates#1976)
+- API endpoints for retrieving Intermediate certificates (smallstep/certificates#1962)
+- Enable use of OIDC provisioner with private identity providers and a certificate from step-ca (smallstep/certificates#1940)
+- Support for verifying `cnf` and `x5rt#S256` claim when provided in token (smallstep/certificates#1660)
+- Add Wire integration to ACME provisioner (smallstep/certificates#1666)
+
+### Changed
+
+- Clarified SSH certificate policy errors (smallstep/certificates#1951)
+
+### Fixed
+
+- Nebula ECDSA P-256 support (smallstep/certificates#1662)
+
 ## [0.27.2] - 2024-07-18
 
 ### Added