Add GetDeliveryApiValue method to make it compatible with later versions of 12 and 13

Author: Rockerby

src/Our.Umbraco.Meganav/Our.Umbraco.Meganav.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>net5.0;net6.0;net7.0</TargetFrameworks>
+    <TargetFrameworks>net5.0;net6.0;net7.0;net8.0</TargetFrameworks>
     <Version Condition="'$(BUILD_BUILDNUMBER)' == ''">1.0.0.0</Version>
     <Version Condition="'$(BUILD_BUILDNUMBER)' != ''">$(BUILD_BUILDNUMBER)</Version>
     <Description>A flexible, draggable link picker for constructing site navigation menus in Umbraco</Description>
@@ -31,4 +31,7 @@
   <ItemGroup Condition="'$(TargetFramework)' == 'net7.0'">
     <PackageReference Include="Umbraco.Cms.Infrastructure" Version="[11.0.0,13.0.0)" />
   </ItemGroup>
+  <ItemGroup Condition="'$(TargetFramework)' == 'net8.0'">
+    <PackageReference Include="Umbraco.Cms.Infrastructure" Version="[13.0.0,14.0.0)" />
+  </ItemGroup>
 </Project>

src/Our.Umbraco.Meganav/PublishedContent/PublishedElementProperty.cs

@@ -26,6 +26,8 @@ public PublishedElementProperty(IPublishedPropertyType propertyType, IPublishedE
 
         public object GetSourceValue(string culture = null, string segment = null) => _sourceValue.Value;
 
+        public object GetDeliveryApiValue(bool expanding, string culture = null, string segment = null) => _objectValue.Value;
+
         public object GetValue(string culture = null, string segment = null) => _objectValue.Value;
 
         public object GetXPathValue(string culture = null, string segment = null) => _xpathValue.Value;