Prepare for clientcore beta.9 release (Azure#45176)

Author: srnagar

sdk/clientcore/core/CHANGELOG.md

@@ -1,14 +1,10 @@
 # Release History
 
-## 1.0.0-beta.9 (Unreleased)
+## 1.0.0-beta.9 (2025-04-30)
 
 ### Features Added
-
-### Breaking Changes
-
-### Bugs Fixed
-
-### Other Changes
+- Added RestProxy back [#45149](https://github.com/Azure/azure-sdk-for-java/pull/45149)
+- Added CoreException type as the base type for all exceptions [#44892](https://github.com/Azure/azure-sdk-for-java/pull/44892)
 
 ## 1.0.0-beta.8 (2025-04-03)
 

sdk/clientcore/core/README.md

@@ -25,7 +25,7 @@ add the direct dependency to your project as follows.
 <dependency>
     <groupId>io.clientcore</groupId>
     <artifactId>core</artifactId>
-    <version>1.0.0-beta.6</version>
+    <version>1.0.0-beta.9</version>
 </dependency>
 ```
 [//]: # ({x-version-update-end})