Update test SDK, coverlet; remove System.Text.Json refs

Upgraded Microsoft.NET.Test.Sdk to 18.0.1 and coverlet.collector to 6.0.4 in test project. Removed System.Text.Json package references for all target frameworks in main project.

Author: Ghaith Prosoft

NETCore.Keycloak.Client.Tests/NETCore.Keycloak.Client.Tests.csproj

@@ -17,11 +17,11 @@
   <ItemGroup>
     <PackageReference Include="AutoFixture" Version="4.18.1" PrivateAssets="all" />
     <PackageReference Include="Bogus" Version="35.6.5" PrivateAssets="all" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.6.0" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.1" PrivateAssets="all" />
     <PackageReference Include="Moq" Version="4.20.72" PrivateAssets="all" />
     <PackageReference Include="MSTest.TestAdapter" Version="3.0.4" PrivateAssets="all" />
     <PackageReference Include="MSTest.TestFramework" Version="3.0.4" PrivateAssets="all" />
-    <PackageReference Include="coverlet.collector" Version="6.0.0" PrivateAssets="all" />
+    <PackageReference Include="coverlet.collector" Version="6.0.4" PrivateAssets="all" />
     <PackageReference Include="PasswordGenerator" Version="2.1.0" PrivateAssets="all" />
   </ItemGroup>
 

NETCore.Keycloak.Client/NETCore.Keycloak.Client.csproj

@@ -43,7 +43,6 @@
 		<PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="10.0.1" />
 		<PackageReference Include="Microsoft.AspNetCore.Authentication" Version="2.3.9" />
 		<PackageReference Include="Microsoft.AspNetCore.Authentication.Abstractions" Version="2.3.9" />
-		<PackageReference Include="System.Text.Json" Version="8.0.6" />
 	</ItemGroup>
 
 	<ItemGroup Condition="'$(TargetFramework)' == 'net9.0'">
@@ -53,7 +52,6 @@
 		<PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="10.0.1" />
 		<PackageReference Include="Microsoft.AspNetCore.Authentication" Version="2.3.9" />
 		<PackageReference Include="Microsoft.AspNetCore.Authentication.Abstractions" Version="2.3.9" />
-		<PackageReference Include="System.Text.Json" Version="9.0.11" />
 	</ItemGroup>
 
 	<ItemGroup Condition="'$(TargetFramework)' == 'net10.0'">
@@ -63,6 +61,5 @@
 		<PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="10.0.1" />
 		<PackageReference Include="Microsoft.AspNetCore.Authentication" Version="2.3.9" />
 		<PackageReference Include="Microsoft.AspNetCore.Authentication.Abstractions" Version="2.3.9" />
-		<PackageReference Include="System.Text.Json" Version="10.0.1" />
 	</ItemGroup>
 </Project>