Bump Microsoft.Owin in /samples/aspnet/Katana/HelloWorldRawOwin (#274)

Bumps [Microsoft.Owin](https://github.com/aspnet/AspNetKatana) from 3.0.0 to 4.2.2.
- [Release notes](https://github.com/aspnet/AspNetKatana/releases)
- [Commits](https://github.com/aspnet/AspNetKatana/compare/v3.0.0...v4.2.2)

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

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samples/aspnet/Katana/HelloWorldRawOwin/packages.config

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="Microsoft.Owin" version="3.0.0" targetFramework="net45" />
+  <package id="Microsoft.Owin" version="4.2.2" targetFramework="net45" />
   <package id="Microsoft.Owin.Host.SystemWeb" version="3.0.0" targetFramework="net45" />
   <package id="Owin" version="1.0" targetFramework="net40" />
 </packages>