cake build project changed to .net9.0

Author: TomKovac

cake/Build.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <RunWorkingDirectory>$(MSBuildProjectDirectory)</RunWorkingDirectory>
 	  <IsPackable>false</IsPackable>
   </PropertyGroup>