Update targets

Author: alexeyzimarev

src/Directory.Build.props

@@ -1,7 +1,7 @@
 <Project>
     <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildProjectDirectory), 'RestSharp.sln'))\props\Common.props"/>
     <PropertyGroup>
-        <TargetFrameworks>netstandard2.0;net471;net48;net8.0;net9.0</TargetFrameworks>
+        <TargetFrameworks>netstandard2.0;net462;net8.0;net9.0</TargetFrameworks>
         <PackageIcon>restsharp.png</PackageIcon>
         <PackageLicenseExpression>Apache-2.0</PackageLicenseExpression>
         <PackageProjectUrl>https://restsharp.dev</PackageProjectUrl>

test/Directory.Build.props

@@ -3,7 +3,7 @@
     <PropertyGroup>
         <IsTestProject>true</IsTestProject>
         <IsPackable>false</IsPackable>
-        <TargetFrameworks>net48;net8.0;net9.0</TargetFrameworks>
+        <TargetFrameworks>net462;net8.0;net9.0</TargetFrameworks>
         <Nullable>disable</Nullable>
         <NoWarn>xUnit1033</NoWarn>
         <VSTestLogger>trx%3bLogFileName=$(MSBuildProjectName).trx</VSTestLogger>