Remove unnecessary reference to Microsoft.NETFramework.ReferenceAssemblies

Author: 0xced

tests/Serilog.Formatting.Log4Net.Tests.csproj

@@ -13,7 +13,6 @@
     <PackageReference Include="coverlet.msbuild" Version="3.0.3" PrivateAssets="all" />
     <PackageReference Include="FluentAssertions" Version="5.10.3" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.1" />
-    <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.0" />
     <PackageReference Include="PublicApiGenerator" Version="10.2.0" />
     <PackageReference Include="ReportGenerator" Version="4.8.6" />
     <PackageReference Include="Serilog.Enrichers.Environment" Version="2.1.3" />