Address review feedback

Author: MaggieKimani1

src/Microsoft.OpenApi/Microsoft.OpenApi.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
     <PropertyGroup>
         <TargetFrameworks>netstandard2.0;net462</TargetFrameworks>
-        <LangVersion>9.0</LangVersion>
+        <LangVersion>Latest</LangVersion>
         <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
         <PackageIconUrl>http://go.microsoft.com/fwlink/?LinkID=288890</PackageIconUrl>
         <PackageProjectUrl>https://github.com/Microsoft/OpenAPI.NET</PackageProjectUrl>

test/Microsoft.OpenApi.SmokeTests/Microsoft.OpenApi.SmokeTests.csproj

@@ -1,11 +1,10 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net60</TargetFrameworks>
+    <TargetFrameworks>net6.0</TargetFrameworks>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
-    <DefineConstants>TRACE;DEBUG;NET60</DefineConstants>
   </PropertyGroup>
 
   <ItemGroup>