feat: add .net 9 support

Author: pdevito3

src/HeimGuard/HeimGuard.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
-        <TargetFrameworks>netcoreapp3.1;net5.0;net6.0;net7.0;net8.0</TargetFrameworks>
+        <TargetFrameworks>netcoreapp3.1;net5.0;net6.0;net7.0;net8.0;net9.0</TargetFrameworks>
     </PropertyGroup>
 
     <ItemGroup>
@@ -27,6 +27,10 @@
         <PackageReference Include="Microsoft.AspNetCore.Authorization" Version="8.0.11" />
         <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="8.0.1" />
     </ItemGroup>
+    <ItemGroup Condition="'$(TargetFramework)' == 'net9.0'">
+        <PackageReference Include="Microsoft.AspNetCore.Authorization" Version="9.0.0" />
+        <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="9.0.0" />
+    </ItemGroup>
 
     <PropertyGroup>
         <AssemblyVersion>1.0.1</AssemblyVersion>