fixed NuGet central package management compliance

Author: Aaronontheweb

src/1-stateful-prompts/AI.StatefulPrompts.Business/AI.StatefulPrompts.Business.csproj

@@ -1,7 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
-        <TargetFramework>net9.0</TargetFramework>
         <ImplicitUsings>enable</ImplicitUsings>
         <Nullable>enable</Nullable>
     </PropertyGroup>

src/1-stateful-prompts/AI.StatefulPrompts.WebUI/AI.StatefulPrompts.WebUI.csproj

@@ -1,13 +1,12 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
     <PropertyGroup>
-        <TargetFramework>net9.0</TargetFramework>
         <Nullable>enable</Nullable>
         <ImplicitUsings>enable</ImplicitUsings>
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="9.0.3"/>
+        <PackageReference Include="Microsoft.AspNetCore.OpenApi"/>
     </ItemGroup>
 
     <ItemGroup>