Bump Microsoft.Owin

Bumps [Microsoft.Owin](https://github.com/aspnet/AspNetKatana) from 3.0.1 to 4.0.0.
- [Release notes](https://github.com/aspnet/AspNetKatana/releases)
- [Commits](aspnet/AspNetKatana@v3.0.1...v4.0.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

samples/features/security/contoso-clinic/src/ContosoClinic/packages.config

@@ -15,7 +15,7 @@
   <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="1.0.0" targetFramework="net461" />
   <package id="Microsoft.jQuery.Unobtrusive.Validation" version="3.2.3" targetFramework="net461" />
   <package id="Microsoft.Net.Compilers" version="1.0.0" targetFramework="net461" developmentDependency="true" />
-  <package id="Microsoft.Owin" version="3.0.1" targetFramework="net461" />
+  <package id="Microsoft.Owin" version="4.0.0" targetFramework="net461" />
   <package id="Microsoft.Owin.Host.SystemWeb" version="3.0.1" targetFramework="net461" />
   <package id="Microsoft.Owin.Security" version="3.0.1" targetFramework="net461" />
   <package id="Microsoft.Owin.Security.Cookies" version="3.0.1" targetFramework="net461" />