Opt in to NuGet security audits.

Author: bgrainger

src/Directory.Build.props

@@ -29,6 +29,8 @@
     <NoWarn>$(NoWarn);1591;CA1708;CA1835;CA2215;CA5397;NU5105;SYSLIB0039</NoWarn>
     <MinVerDefaultPreReleaseIdentifiers>beta.0</MinVerDefaultPreReleaseIdentifiers>
     <ArtifactsPath>$(MSBuildThisFileDirectory)..\artifacts</ArtifactsPath>
+    <NuGetAudit>true</NuGetAudit>
+    <NuGetAuditLevel>low</NuGetAuditLevel>
   </PropertyGroup>
 
   <PropertyGroup Condition=" '$(Configuration)' == 'Release' ">