Bump Microsoft.Owin from 4.1.1 to 4.2.2 in /src/docfx (#8160)

Bumps [Microsoft.Owin](https://github.com/aspnet/AspNetKatana) from 4.1.1 to 4.2.2.
- [Release notes](https://github.com/aspnet/AspNetKatana/releases)
- [Commits](aspnet/AspNetKatana@v4.1.1...v4.2.2)

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

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src/docfx/docfx.csproj

@@ -36,7 +36,7 @@
     <PackageReference Include="CommandLineParser" Version="1.9.71" />
     <PackageReference Include="NuGet.Common" Version="5.7.0" />
     <PackageReference Include="Owin" Version="1.0.0" />
-    <PackageReference Include="Microsoft.Owin" Version="4.1.1" />
+    <PackageReference Include="Microsoft.Owin" Version="4.2.2" />
     <PackageReference Include="Microsoft.Owin.FileSystems" Version="4.1.1" />
     <PackageReference Include="Microsoft.Owin.Host.HttpListener" Version="4.1.1" />
     <PackageReference Include="Microsoft.Owin.Hosting" Version="4.1.1" />