fix: samples/client/others/csharp-complex-files/src/Org.OpenAPITools/Org.OpenAPITools.csproj to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-DOTNET-SYSTEMTEXTJSON-8168848

Author: snyk-bot

samples/client/others/csharp-complex-files/src/Org.OpenAPITools/Org.OpenAPITools.csproj

@@ -24,7 +24,7 @@
     <PackageReference Include="CompareNETObjects" Version="4.83.0" />
     <PackageReference Include="JsonSubTypes" Version="2.0.1" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
-    <PackageReference Include="RestSharp" Version="112.0.0" />
+    <PackageReference Include="RestSharp" Version="113.0.0" />
     <PackageReference Include="Polly" Version="8.1.0" />
     <PackageReference Include="System.ComponentModel.Annotations" Version="5.0.0" />
   </ItemGroup>