[Identity] Patch release (#33918)

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- [ ] Added impacted package name to the issue description
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Author: minhanh-phan

sdk/identity/identity/CHANGELOG.md

@@ -1,18 +1,12 @@
 # Release History
 
-## 4.9.1 (Unreleased)
-
-### Features Added
-
-### Breaking Changes
+## 4.9.1 (2025-04-17)
 
 ### Bugs Fixed
 
 - Update the order for conditional exports so that the most specific conditions are listed first. [#33914](https://github.com/Azure/azure-sdk-for-js/pull/33914)
 - Fix a bug in which `self.location` is undefined in specific environment. [#33914](https://github.com/Azure/azure-sdk-for-js/pull/33914)
 
-### Other Changes
-
 ## 4.9.0 (2025-04-16)
 
 ### Features Added