Use ItemGroup Condition != 'net462' in poject #if !NET4X in the file itself

Author: vbilopav

benchmarks/Dapper.Tests.Performance/Benchmarks.Norm.cs

@@ -1,4 +1,5 @@
-using BenchmarkDotNet.Attributes;
+#if !NET4X
+using BenchmarkDotNet.Attributes;
 using System.ComponentModel;
 using System.Linq;
 using Norm;
@@ -37,4 +38,4 @@ public Post Read()
         }
     }
 }
-
+#endif

benchmarks/Dapper.Tests.Performance/Dapper.Tests.Performance.csproj

@@ -47,13 +47,8 @@
   </ItemGroup>
   <ItemGroup Condition="'$(TargetFramework)' != 'net462'">
     <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="5.0.0" />
-  </ItemGroup>
-  <ItemGroup Condition="'$(TargetFramework)' == 'netcoreapp3.1' Or '$(TargetFramework)' == 'net5.0'">
-    <PackageReference Include="Norm.net">
-      <Version>3.1.0</Version>
-    </PackageReference>
-  </ItemGroup>
-  <ItemGroup>
-    <Compile Remove="Benchmarks.Norm.cs" Condition="'$(TargetFramework)' != 'netcoreapp3.1' And '$(TargetFramework)' != 'net5.0'" />
+    <PackageReference Include="Norm.net">
+      <Version>3.2.0</Version>
+    </PackageReference>
   </ItemGroup>
 </Project>