fix: change language version to fix build issue

I'm not sure exactly why this change is even necessary, both PRs built fine and main has been building fine even with the collection literal since its introduction 5 months ago

Author: pandinocoder

Directory.Build.props

@@ -20,7 +20,7 @@
   <PropertyGroup Label="Language Properties">
     <Deterministic>true</Deterministic>
     <ImplicitUsings>enable</ImplicitUsings>
-    <LangVersion>latest</LangVersion>
+    <LangVersion>preview</LangVersion>
     <Nullable>enable</Nullable>
     <RuntimeIdentifiers>linux-arm64;linux-x64;osx-arm64;osx-x64;win-x64</RuntimeIdentifiers>
     <TargetFramework>net7.0</TargetFramework>