Suppress NU1701 build warning for Microsoft.Build package

https://docs.microsoft.com/en-us/nuget/reference/errors-and-warnings/nu1701

Author: gitfool

src/GitVersionTask.MsBuild/GitVersionTask.MsBuild.csproj

@@ -8,7 +8,7 @@
 
     <ItemGroup>
         <PackageReference Include="System.Runtime.Loader" Version="4.3.0" />
-        <PackageReference Include="Microsoft.Build" Version="16.4.0" />
+        <PackageReference Include="Microsoft.Build" Version="16.4.0" NoWarn="NU1701" />
         <PackageReference Include="Microsoft.Build.Tasks.Core" Version="16.4.0" />
     </ItemGroup>