[mcp] Updated MCP SDK (#8942)

Author: glen-84

src/Directory.Packages.props

@@ -15,7 +15,7 @@
     <PackageVersion Include="Basic.Reference.Assemblies.Net80" Version="1.8.3" />
     <PackageVersion Include="Basic.Reference.Assemblies.Net90" Version="1.8.3" />
     <PackageVersion Include="CaseConverter" Version="2.0.1" />
-    <PackageVersion Include="ChilliCream.ModelContextProtocol.AspNetCore" Version="0.0.1-p.3" />
+    <PackageVersion Include="ChilliCream.ModelContextProtocol.AspNetCore" Version="0.0.1-p.4" />
     <PackageVersion Include="ChilliCream.Nitro.App" Version="$(NitroVersion)" />
     <PackageVersion Include="ChilliCream.Testing.Utilities" Version="0.2.0" />
     <PackageVersion Include="coverlet.collector" Version="6.0.4" />

src/HotChocolate/Adapters/src/Adapters.Mcp.Core/Extensions/ServiceCollectionExtensions.cs

@@ -23,7 +23,11 @@ public static void AddMcpServices(this IServiceCollection services, string schem
                 static (sp, name) => new McpRequestExecutorProxy(
                     sp.GetRequiredService<IRequestExecutorProvider>(),
                     sp.GetRequiredService<IRequestExecutorEvents>(),
+#if NET10_0_OR_GREATER
                     (string)name))
+#else
+                    (string)name!))
+#endif
             .AddKeyedSingleton(
                 schemaName,
                 static (sp, name) => new StreamableHttpHandlerProxy(