removing netcoreapp3.1 from filesystem unit tests

Author: thepirat000

test/Audit.FileSystem.UnitTest/Audit.FileSystem.UnitTest.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
 	<PropertyGroup>
-		<TargetFrameworks>net462;netcoreapp3.1;net6.0</TargetFrameworks>
+		<TargetFrameworks>net462;net6.0</TargetFrameworks>
 		<IsPackable>false</IsPackable>
 		<IsTestProject>true</IsTestProject>
 		<DefineConstants>$(DefineConstants);STRONG_NAME</DefineConstants>

test/Audit.FileSystem.UnitTest/FileSystemTests.cs

@@ -34,7 +34,6 @@ public void Test_FileDataProvider_FluentApi()
             Assert.That(x.FilenamePrefix.GetDefault(), Is.EqualTo("px"));
         }
 
-#if !NETCOREAPP3_1
         [Test]
         public void Test_FileSystem_Text()
         {
@@ -126,7 +125,6 @@ public void FileSystemMonitor_OnPredicateException_ReturnsError()
 
             Directory.Delete(folder, true);
         }
-#endif
 
         [Test]
         public void Test_FileSystem_Binary()