Bump ServiceStack in /src/TechStacks/TechStacks.Tests

Bumps [ServiceStack](https://github.com/ServiceStack/ServiceStack) from 5.6.0 to 5.9.2.
- [Release notes](https://github.com/ServiceStack/ServiceStack/releases)
- [Commits](ServiceStack/ServiceStack@v5.6...v5.9.2)

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

Author: dependabot[bot]

src/TechStacks/TechStacks.Tests/packages.config

@@ -2,7 +2,7 @@
 <packages>
   <package id="Npgsql" version="4.0.9" targetFramework="net45" />
   <package id="NUnit" version="3.12.0" targetFramework="net45" />
-  <package id="ServiceStack" version="5.6.0" targetFramework="net45" />
+  <package id="ServiceStack" version="5.9.2" targetFramework="net45" />
   <package id="ServiceStack.Client" version="5.6.0" targetFramework="net45" />
   <package id="ServiceStack.Common" version="5.6.0" targetFramework="net45" />
   <package id="ServiceStack.Interfaces" version="5.6.0" targetFramework="net45" />