Bump ServiceStack

Bumps [ServiceStack](https://github.com/ServiceStack/ServiceStack) from 4.5.14 to 5.9.2.
- [Release notes](https://github.com/ServiceStack/ServiceStack/releases)
- [Commits](ServiceStack/ServiceStack@v4.5.14...v5.9.2)

---
updated-dependencies:
- dependency-name: ServiceStack
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Samples/ServiceAPI/CSharp/OpenIdConnectPlugin/OpenIdConnectPlugin/packages.config

@@ -8,7 +8,7 @@
   <package id="Microsoft.IdentityModel.Tokens" version="5.2.2" targetFramework="net45" />
   <package id="Microsoft.Net.Http" version="2.2.29" targetFramework="net45" />
   <package id="Newtonsoft.Json" version="10.0.1" targetFramework="net45" />
-  <package id="ServiceStack" version="4.5.14" targetFramework="net45" />
+  <package id="ServiceStack" version="5.9.2" targetFramework="net45" />
   <package id="ServiceStack.Client" version="4.5.14" targetFramework="net45" />
   <package id="ServiceStack.Common" version="4.5.14" targetFramework="net45" />
   <package id="ServiceStack.Interfaces" version="4.5.14" targetFramework="net45" />