changed net6.0 to net8.0

Author: nik-solcast

generate_sdk_docs.py

@@ -34,7 +34,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
     <ProjectReference Include="{SOLCAST_PROJECT_PATH}" />