Update dependency libphonenumber-csharp to 8.13.50

Author: renovate-bot

GUI/GUI.csproj

@@ -28,7 +28,7 @@
     <ItemGroup>
       <PackageReference Include="CefSharp.Wpf" Version="131.2.70" />
       <PackageReference Include="CredentialManagement" Version="1.0.2" />
-      <PackageReference Include="libphonenumber-csharp" Version="8.12.56" />
+      <PackageReference Include="libphonenumber-csharp" Version="8.13.50" />
     </ItemGroup>
 
     <ItemGroup>