[Identity] Prep release (Azure#40009)

Signed-off-by: Paul Van Eck <[email protected]>

Author: pvaneck

sdk/identity/azure-identity/CHANGELOG.md

@@ -1,15 +1,10 @@
 # Release History
 
-## 1.20.1 (Unreleased)
-
-### Features Added
-
-### Breaking Changes
-
-### Bugs Fixed
+## 1.21.0 (2025-03-11)
 
 ### Other Changes
 
+- Updated the asynchronous `CertificateCredential` to use the PS256 algorithm with PSS padding for certificate authentication in non-ADFS tenants. ([#39761](https://github.com/Azure/azure-sdk-for-python/pull/39761))
 - Deprecated `UsernamePasswordCredential`, as it doesn't support multifactor authentication (MFA). MFA will soon be enforced on all Microsoft Entra tenants. For more details, see [Planning for mandatory MFA](https://aka.ms/mfaforazure). ([#39785](https://github.com/Azure/azure-sdk-for-python/pull/39785))
 
 ## 1.20.0 (2025-02-11)

sdk/identity/azure-identity/azure/identity/_version.py

@@ -2,4 +2,4 @@
 # Copyright (c) Microsoft Corporation.
 # Licensed under the MIT License.
 # ------------------------------------
-VERSION = "1.20.1"
+VERSION = "1.21.0"