Temporarily remove net6.0 from target frameworks to speed up compilation

Author: mikasoukhov

common_target_net.props

@@ -1,7 +1,7 @@
 <Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <Import Project="common_target_common.props" />
   <PropertyGroup>
-    <StockSharpTargets Condition="'$(StockSharpTargets)' == ''">$(NetOldTfm);$(NetTfm)</StockSharpTargets>
+    <StockSharpTargets Condition="'$(StockSharpTargets)' == ''">$(NetTfm)</StockSharpTargets>
     <TargetFrameworks>$(StockSharpTargets)</TargetFrameworks>
 
     <GenerateDocumentationFile>true</GenerateDocumentationFile>

common_target_netwindows.props

@@ -1,7 +1,7 @@
 <Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <Import Project="common_target_common.props" />
   <PropertyGroup>
-    <StockSharpTargets Condition="'$(StockSharpTargets)' == ''">$(NetOldTfm)-windows;$(NetTfm)-windows</StockSharpTargets>
+    <StockSharpTargets Condition="'$(StockSharpTargets)' == ''">$(NetTfm)-windows</StockSharpTargets>
     <TargetFrameworks>$(StockSharpTargets)</TargetFrameworks>
   </PropertyGroup>
 </Project>

common_target_tests.props

@@ -2,7 +2,7 @@
   <Import Project="common_target_net.props" />
   <PropertyGroup>
     <GenerateDocumentationFile>false</GenerateDocumentationFile>
-    <TargetFrameworks>$(NetOldTfm);$(NetTfm)</TargetFrameworks>
+    <TargetFrameworks>$(NetTfm)</TargetFrameworks>
     <IsPackable>false</IsPackable>
   </PropertyGroup>