Bump RestSharp in /src/Regula.DocumentReader.WebClient

Bumps [RestSharp](https://github.com/restsharp/RestSharp) from 106.11.5 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@106.11.5...106.12)

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

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Author: dependabot[bot]

src/Regula.DocumentReader.WebClient/Regula.DocumentReader.WebClient.csproj

@@ -13,7 +13,7 @@
     <PackageReference Include="JsonSubTypes" Version="1.7.0" />
     <PackageReference Include="Microsoft.CSharp" Version="4.7.0" />
     <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
-    <PackageReference Include="RestSharp" Version="106.11.5" />
+    <PackageReference Include="RestSharp" Version="106.12.0" />
     <PackageReference Include="System.ComponentModel.Annotations" Version="4.7.0" />
   </ItemGroup>
 </Project>