Reduce severity for NUnit2040

Author: hazzik

build-common/NHibernate.props

@@ -14,7 +14,7 @@
     <FileVersion Condition="'$(VersionSuffix)' != '' AND '$(BuildNumber)' != ''">$(VersionPrefix).$(BuildNumber)</FileVersion>
     <FileVersion Condition="'$(FileVersion)' == ''">$(VersionPrefix).0</FileVersion>
 
-    <NhAppTargetFrameworks Condition ="$(NhAppTargetFrameworks) == ''">net48;net6.0</NhAppTargetFrameworks>
+    <NhAppTargetFrameworks Condition ="$(NhAppTargetFrameworks) == ''">net6.0</NhAppTargetFrameworks>
     <NhLibTargetFrameworks Condition ="$(NhLibTargetFrameworks) == ''">net461;net48;netcoreapp2.0;netstandard2.0;netstandard2.1;net6.0</NhLibTargetFrameworks>
     <NhNetFx>false</NhNetFx>
     <NhNetFx Condition="$(TargetFramework.StartsWith('net4'))">true</NhNetFx>