Try Microsoft.OpenApi v2 preview

Update to see if it compiles.

Author: martincostello

src/TodoApp/TodoApp.csproj

@@ -17,7 +17,7 @@
     <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="9.0.0" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="9.0.0" />
     <PackageReference Include="Microsoft.Extensions.ApiDescription.Server" Version="9.0.0" PrivateAssets="all" />
-    <PackageReference Include="Microsoft.OpenApi" Version="1.6.22" />
+    <PackageReference Include="Microsoft.OpenApi" Version="2.0.0-preview2" />
     <PackageReference Include="Microsoft.TypeScript.MSBuild" Version="5.6.2" PrivateAssets="all" />
     <PackageReference Include="NSwag.AspNetCore" Version="14.1.0" />
     <PackageReference Include="Swashbuckle.AspNetCore" Version="7.0.0" />