[App Config] Run Prepare Release Script (#28789)

### Packages impacted by this PR
@azure/app-configuration

### Issues associated with this PR


### Describe the problem that is addressed by this PR
Run prepare release script with the correct version

Author: minhanh-phan

sdk/appconfiguration/app-configuration/CHANGELOG.md

@@ -1,6 +1,6 @@
 # Release History
 
-## 1.5.1 (2024-03-05)
+## 1.6.0-beta.1 (2024-03-05)
 
 ### Features Added
 

sdk/appconfiguration/app-configuration/package.json

@@ -2,7 +2,7 @@
   "name": "@azure/app-configuration",
   "author": "Microsoft Corporation",
   "description": "An isomorphic client library for the Azure App Configuration service.",
-  "version": "1.5.1",
+  "version": "1.6.0-beta.1",
   "sdk-type": "client",
   "keywords": [
     "node",

sdk/appconfiguration/app-configuration/src/internal/constants.ts

@@ -4,7 +4,7 @@
 /**
  * @internal
  */
-export const packageVersion = "1.5.1";
+export const packageVersion = "1.6.0-beta.1";
 
 /**
  * @internal

sdk/appconfiguration/app-configuration/swagger/swagger.md

@@ -4,7 +4,7 @@
 
 ```yaml
 package-name: app-configuration
-package-version: "1.5.1"
+package-version: "1.6.0-beta.1"
 title: AppConfiguration
 description: App Configuration client
 enable-xml: true