Apply suggestions from code review

Author: martincostello

src/TodoApp/TodoApp.csproj

@@ -17,7 +17,7 @@
     <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="10.0.0-preview.5.25277.114" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="10.0.0-preview.5.25277.114" />
     <PackageReference Include="Microsoft.Extensions.ApiDescription.Server" Version="10.0.0-preview.5.25277.114" PrivateAssets="all" />
-    <PackageReference Include="Microsoft.OpenApi" Version="2.0.0-preview.17" />
+    <PackageReference Include="Microsoft.OpenApi" Version="2.0.0-preview.18" />
     <PackageReference Include="Microsoft.TypeScript.MSBuild" Version="5.8.3" PrivateAssets="all" />
     <PackageReference Include="NSwag.AspNetCore" Version="14.4.0" />
     <PackageReference Include="Swashbuckle.AspNetCore" Version="9.0.0-pr.3283.1497" />