Bump RestSharp in /csharp/Acme.App.MastercardApi.Client

Bumps [RestSharp](https://github.com/restsharp/RestSharp) from 106.11.7 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@106.11.7...106.12)

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

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

Author: dependabot[bot]

csharp/Acme.App.MastercardApi.Client/Acme.App.MastercardApi.Client.csproj

@@ -24,7 +24,7 @@
     <PackageReference Include="Mastercard.Developer.ClientEncryption.RestSharpV2" Version="1.1.2" />
     <PackageReference Include="Mastercard.Developer.OAuth1Signer.RestSharpV2" Version="1.3.2" />
     <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
-    <PackageReference Include="RestSharp" Version="106.11.7" />
+    <PackageReference Include="RestSharp" Version="106.12.0" />
     <PackageReference Include="Polly" Version="7.2.1" />
     <PackageReference Include="System.ComponentModel.Annotations" Version="5.0.0" />
   </ItemGroup>