Increment version after release (#4025)

Increment package version after release

Co-authored-by: azure-sdk <azuresdk@microsoft.com>

servers/Azure.Mcp.Server/CHANGELOG.md

@@ -2,6 +2,16 @@
 
 The Azure MCP Server updates automatically by default whenever a new release comes out 🚀. We ship updates twice a week on Tuesdays and Thursdays 😊
 
+## 4.0.0-beta.4 (Unreleased)
+
+### Features Added
+
+### Breaking Changes
+
+### Bugs Fixed
+
+### Other Changes
+
 ## 4.0.0-beta.3 (2026-10-22)
 
 ### Features Added

servers/Azure.Mcp.Server/src/Azure.Mcp.Server.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <Version>4.0.0-beta.3</Version>
+    <Version>4.0.0-beta.4</Version>
     <CliName>azmcp</CliName>
     <AssemblyTitle>Azure MCP Server</AssemblyTitle>
     <Description>Azure MCP Server - Model Context Protocol implementation for Azure</Description>