fix: src/It.FattureInCloud.Sdk/It.FattureInCloud.Sdk.csproj to reduce vulnerabilities (#141)

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

Co-authored-by: snyk-bot <snyk-bot@snyk.io>

Author: madbit-snyk-bot

src/It.FattureInCloud.Sdk/It.FattureInCloud.Sdk.csproj

@@ -25,7 +25,7 @@
   <ItemGroup>
     <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" />
     <None Include="../../README.md" Pack="true" PackagePath="\"/>