Bump Microsoft.Owin in /test/System.Web.Http.Owin.Test (#358)

Bumps [Microsoft.Owin](https://github.com/aspnet/AspNetKatana) from 2.0.2 to 4.1.1.
- [Release notes](https://github.com/aspnet/AspNetKatana/releases)
- [Commits](aspnet/AspNetKatana@v2.0.2...v4.1.1)

---
updated-dependencies:
- dependency-name: Microsoft.Owin
  dependency-type: direct:production
...

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test/System.Web.Http.Owin.Test/packages.config

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="Castle.Core" version="4.2.1" targetFramework="net452" />
-  <package id="Microsoft.Owin" version="2.0.2" targetFramework="net452" />
+  <package id="Microsoft.Owin" version="4.1.1" targetFramework="net452" />
   <package id="Microsoft.Owin.Host.HttpListener" version="2.0.2" targetFramework="net452" />
   <package id="Microsoft.Owin.Hosting" version="2.0.2" targetFramework="net452" />
   <package id="Moq" version="4.7.142" targetFramework="net452" />