Bump Microsoft.AspNet.Identity.Owin in /aspnet-samples/AdvancedChatRoom (#238)

Bumps [Microsoft.AspNet.Identity.Owin](https://github.com/aspnet/AspNetIdentity) from 2.2.2 to 2.2.4.
- [Commits](https://github.com/aspnet/AspNetIdentity/commits)

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

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aspnet-samples/AdvancedChatRoom/packages.config

@@ -1,8 +1,8 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="jQuery" version="3.3.1" targetFramework="net461" />
   <package id="Microsoft.AspNet.Identity.Core" version="2.2.2" targetFramework="net461" />
-  <package id="Microsoft.AspNet.Identity.Owin" version="2.2.2" targetFramework="net461" />
+  <package id="Microsoft.AspNet.Identity.Owin" version="2.2.4" targetFramework="net461" />
   <package id="Microsoft.AspNet.SignalR" version="2.4.1" targetFramework="net461" />
   <package id="Microsoft.AspNet.SignalR.Core" version="2.4.1" targetFramework="net461" />
   <package id="Microsoft.AspNet.SignalR.JS" version="2.4.1" targetFramework="net461" />