bump Smdn.Reflection.ReverseGenerating.ListApi.MSBuild.Tasks up to 1.6.0

Author: smdn

src/Directory.Build.props

@@ -26,7 +26,7 @@ SPDX-License-Identifier: MIT
 
   <PropertyGroup Label="API list generator configurations">
     <APIListOutputBaseDirectory>$(MSBuildThisFileDirectory)..\doc\api-list\</APIListOutputBaseDirectory>
-    <APIListPackageVersion>1.4.1</APIListPackageVersion>
+    <APIListPackageVersion>1.6.0</APIListPackageVersion>
   </PropertyGroup>
 
   <PropertyGroup Label="package properties">