Bump RestSharp in /recordings-downloader/csharp

Bumps [RestSharp](https://github.com/restsharp/RestSharp) from 106.6.10 to 106.12.0.
- [Release notes](https://github.com/restsharp/RestSharp/releases)
- [Changelog](https://github.com/restsharp/RestSharp/blob/dev/releasenotes.md)
- [Commits](restsharp/RestSharp@106.6.10...106.12)

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

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

recordings-downloader/csharp/Recordings.csproj

@@ -8,7 +8,7 @@
   <ItemGroup>
     <PackageReference Include="Newtonsoft.Json" Version="12.0.2" />
     <PackageReference Include="PureCloudPlatform.Client.V2" Version="104.0.0" />
-    <PackageReference Include="RestSharp" Version="106.6.10" />
+    <PackageReference Include="RestSharp" Version="106.12.0" />
   </ItemGroup>
 
 </Project>