Prepare azidentity 1.6.0-beta.3 for release (#22714)

sdk/azidentity/CHANGELOG.md

@@ -1,17 +1,15 @@
 # Release History
 
-## 1.6.0-beta.3 (Unreleased)
-
-### Features Added
+## 1.6.0-beta.3 (2024-04-09)
 
 ### Breaking Changes
+* `DefaultAzureCredential` now sends a probe request with no retries for IMDS managed identity
+  environments to avoid excessive retry delays when the IMDS endpoint is not available. This
+  should improve credential chain resolution for local development scenarios.
 
 ### Bugs Fixed
 * `ManagedIdentityCredential` now specifies resource IDs correctly for Azure Container Instances
 
-### Other Changes
-* Increased `DefaultAzureCredential` reliability when authenticating a managed identity on an Azure VM
-
 ## 1.6.0-beta.2 (2024-02-06)
 
 ### Breaking Changes