Update to .NET 9 with version 9.0.0

- Change target framework to net9.0
- Update package version to 9.0.0 to align with .NET version
- Update all Microsoft.Extensions.* dependencies to 9.0.0
- Update System.Text.Json to 9.0.0
- Update test project to target net9.0
- This is the maintenance branch for .NET 9 STS support

Author: GmausDev

src/CompactifAI.Client/CompactifAI.Client.csproj

@@ -1,14 +1,14 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <LangVersion>latest</LangVersion>
 
     <!-- NuGet Package Properties -->
     <PackageId>CompactifAI.Client</PackageId>
-    <Version>1.1.0</Version>
+    <Version>9.0.0</Version>
     <Authors>GmausDev</Authors>
     <Company>GmausDev</Company>
     <Description>A .NET client library for the CompactifAI API. Easily integrate AI chat completions, text completions, and audio transcription into your .NET applications.</Description>
@@ -28,12 +28,12 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Extensions.Configuration.Abstractions" Version="8.0.0" />
-    <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="8.0.2" />
-    <PackageReference Include="Microsoft.Extensions.Http" Version="8.0.1" />
-    <PackageReference Include="Microsoft.Extensions.Options" Version="8.0.2" />
-    <PackageReference Include="Microsoft.Extensions.Options.ConfigurationExtensions" Version="8.0.0" />
-    <PackageReference Include="System.Text.Json" Version="8.0.5" />
+    <PackageReference Include="Microsoft.Extensions.Configuration.Abstractions" Version="9.0.0" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="9.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Http" Version="9.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Options" Version="9.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Options.ConfigurationExtensions" Version="9.0.0" />
+    <PackageReference Include="System.Text.Json" Version="9.0.0" />
   </ItemGroup>
 
   <ItemGroup>

tests/CompactifAI.Client.Tests/CompactifAI.Client.Tests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net10.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <IsPackable>false</IsPackable>