OxyplotMauiSample: update MAUI to 10.0.40

* in order to fix strange crashes when opening PanModePage
  (on Android and iOS)
* $(MauiVersion) seems to resovle to 10.0.1 with .NET SDK 10.0.103

Author: janusw

Source/OxyplotMauiSample/OxyplotMauiSample.csproj

@@ -62,7 +62,7 @@
 
 	<ItemGroup>
 		<PackageReference Include="OxyPlot.ExampleLibrary" Version="2.2.0" />
-		<PackageReference Include="Microsoft.Maui.Controls" Version="$(MauiVersion)" />
+		<PackageReference Include="Microsoft.Maui.Controls" Version="10.0.40" />
 	</ItemGroup>
 
 	<ItemGroup>