Bump Microsoft.Owin from 2.0.2 to 4.1.1 in /src/System.Web.Http.Owin (#359)

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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src/System.Web.Http.Owin/packages.config

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="Microsoft.Owin" version="2.0.2" targetFramework="net45" />
+  <package id="Microsoft.Owin" version="4.1.1" targetFramework="net45" />
   <package id="Owin" version="1.0" targetFramework="net45" />
 </packages>