Fixes #2830. v1 Allow use LangVersion 9.0 on the UICatalog project.

UICatalog/UICatalog.csproj

@@ -2,7 +2,7 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <TargetFramework>net7.0</TargetFramework>
-    <LangVersion>8.0</LangVersion>
+    <LangVersion>9.0</LangVersion>
     <StartupObject>UICatalog.UICatalogApp</StartupObject>
     <DockerDefaultTargetOS>Linux</DockerDefaultTargetOS>
     <!-- Version numbers are automatically updated by gitversion when a release is released -->