Update publish target to .NET 9

Author: DSPaul

src/Properties/PublishProfiles/FolderProfile.pubxml

@@ -8,7 +8,7 @@ https://go.microsoft.com/fwlink/?LinkID=208121.
     <Platform>Any CPU</Platform>
     <PublishDir>bin\Publish\win-x64</PublishDir>
     <PublishProtocol>FileSystem</PublishProtocol>
-    <TargetFramework>net7.0-windows</TargetFramework>
+    <TargetFramework>net9.0-windows</TargetFramework>
     <RuntimeIdentifier>win-x64</RuntimeIdentifier>
     <SelfContained>false</SelfContained>
     <PublishSingleFile>true</PublishSingleFile>