up version system.reactove.linq in integration test

Author: fle-bach

docker/integration_tests/XCProjects/HelloWorldV5/CreateInstancesReactiveApi/CreateInstances/CreateInstances.csproj

@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="System.Reactive.Linq" Version="3.1.1" />
+    <PackageReference Include="System.Reactive.Linq" Version="4.1.2" />
   </ItemGroup>
 
   <ItemGroup>