Bump RestSharp from 106.6.9 to 106.12.0 in /CRP.Mvc

Bumps [RestSharp](https://github.com/restsharp/RestSharp) from 106.6.9 to 106.12.0.
- [Release notes](https://github.com/restsharp/RestSharp/releases)
- [Changelog](https://github.com/restsharp/RestSharp/blob/dev/releasenotes.md)
- [Commits](https://github.com/restsharp/RestSharp/commits/106.12)

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

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

Author: dependabot[bot]

CRP.Mvc/packages.config

@@ -53,7 +53,7 @@
   <package id="qTip2" version="2.2.1" targetFramework="net47" />
   <package id="recaptcha" version="1.0.5.0" targetFramework="net47" />
   <package id="Respond" version="1.2.0" targetFramework="net47" />
-  <package id="RestSharp" version="106.6.9" targetFramework="net47" />
+  <package id="RestSharp" version="106.12.0" targetFramework="net47" />
   <package id="Serilog" version="2.8.0" targetFramework="net47" />
   <package id="Serilog.Enrichers.ClientInfo" version="1.2.0" targetFramework="net47" />
   <package id="Serilog.Exceptions" version="1.1.0" targetFramework="net47" />