Update Net 8 Support to use Netx.x instead of Nestandard2.1 (#1703)

Remove Net 7.0

Author: ChrisPulman

Directory.Build.targets

@@ -3,7 +3,7 @@
   <PropertyGroup>
     <Product>Refit HTTP Client Factory Extensions</Product>
     <Description>Refit HTTP Client Factory Extensions</Description>
-    <TargetFrameworks>net462;netstandard2.0;net6.0;net7.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>net462;netstandard2.0;net6.0;net8.0</TargetFrameworks>
     <Nullable>enable</Nullable>
   </PropertyGroup>
 

Refit.HttpClientFactory/Refit.HttpClientFactory.csproj

@@ -3,7 +3,7 @@
   <PropertyGroup>
     <Product>Refit Serializer for Newtonsoft.Json ($(TargetFramework))</Product>
     <Description>Refit Serializers for Newtonsoft.Json</Description>
-    <TargetFrameworks>net462;netstandard2.0;netstandard2.1</TargetFrameworks>
+    <TargetFrameworks>net462;netstandard2.0;net6.0;net7.0;net8.0</TargetFrameworks>
     <GenerateDocumentationFile Condition=" '$(Configuration)' == 'Release' ">true</GenerateDocumentationFile>
     <RootNamespace>Refit</RootNamespace>
     <Nullable>enable</Nullable>