Update NLightning to version 4.0.0 and .NET SDK to version 9.0

- Upgraded NLightning to version 4.0.0, which introduces mandatory item validation in invoices to ensure convergence with other protocol implementations.
- Updated .NET SDK to version 9.0 to maintain compatibility, as NLightning development now targets this version.

Author: moisesPompilio

modules/nlightning/src/Bolts/BOLT11/InvoiceBridge.cs

@@ -3,7 +3,8 @@
 namespace NLightning.CppBridge.Bolts.BOLT11;
 
 using System.Text;
-using NLightning.Bolts.BOLT11;
+using NLightning.Bolt11.Models;
+
 public static class InvoiceBridge
 {
     [UnmanagedCallersOnly(EntryPoint = "DecodeInvoice")]
@@ -22,7 +23,7 @@ public static IntPtr DecodeInvoice(IntPtr invoiceStringPtr)
             StringBuilder resultBuilder = new();
 
             resultBuilder.Append("HASH=").Append(invoice.PaymentHash);
-            resultBuilder.Append(";AMOUNT=").Append(invoice.AmountMilliSats);
+            resultBuilder.Append(";AMOUNT=").Append(invoice.Amount.MilliSatoshi);
             resultBuilder.Append(";DESCRIPTION=").Append(invoice.Description);
             resultBuilder.Append(";RECIPIENT=").Append(invoice.PayeePubKey);
             resultBuilder.Append(";EXPIRY=").Append((int)(invoice.ExpiryDate - DateTimeOffset.FromUnixTimeSeconds(invoice.Timestamp)).TotalSeconds);

modules/nlightning/src/NLightning.CppBridge.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <RootNamespace>NLightning.CppBridge</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
@@ -19,7 +19,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="NLightning.Bolt11" Version="0.2.4" />
+    <PackageReference Include="NLightning.Bolt11" Version="4.0.0" />
   </ItemGroup>
 
 </Project>