Increment package version after release of System.ClientModel (Azure#49465)

Author: azure-sdk

sdk/core/System.ClientModel/CHANGELOG.md

@@ -1,5 +1,15 @@
 # Release History
 
+## 1.4.0-beta.4 (Unreleased)
+
+### Features Added
+
+### Breaking Changes
+
+### Bugs Fixed
+
+### Other Changes
+
 ## 1.4.0-beta.3 (2025-04-16)
 
 ### Bugs Fixed

sdk/core/System.ClientModel/src/System.ClientModel.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <Description>Contains building blocks for clients that call cloud services.</Description>
-    <Version>1.4.0-beta.3</Version>
+    <Version>1.4.0-beta.4</Version>
     <!--The ApiCompatVersion is managed automatically and should not generally be modified manually.-->
     <ApiCompatVersion>1.3.0</ApiCompatVersion>
     <Nullable>enable</Nullable>