fixed redundant PackageReference added by nuget.

Author: smaillet

src/CSemVer.Build.Tasks/CSemVer.Build.Tasks.csproj

@@ -24,7 +24,6 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Build.Framework" />
     <PackageReference Include="Microsoft.Build.Framework" Version="15.7.179" />
     <PackageReference Include="Microsoft.Build.Utilities.Core" Version="15.7.179" />
     <PackageReference Update="@(PackageReference)" PrivateAssets="All" />