chore(deps): update dependency terminal.gui to v2.0.0-pre.706

Author: renovate[bot]

src/ReactiveMvvm.Terminal/ReactiveMvvm.Terminal.csproj

@@ -5,7 +5,7 @@
     </PropertyGroup>
     <ItemGroup>
         <PackageReference Include="ReactiveMarbles.ObservableEvents.SourceGenerator" Version="1.3.1" />
-        <PackageReference Include="Terminal.Gui" Version="2.0.0-pre.251" />
+        <PackageReference Include="Terminal.Gui" Version="2.0.0-pre.706" />
 		<PackageReference Include="NStack.Core" Version="1.1.1" />
     </ItemGroup>
     <ItemGroup>