Enable NuGet audit (#694)

+semver:patch

Author: hazzik

src/Directory.Build.props

@@ -17,6 +17,9 @@
     <AllowedOutputExtensionsInPackageBuildOutputFolder>$(AllowedOutputExtensionsInPackageBuildOutputFolder);.pdb</AllowedOutputExtensionsInPackageBuildOutputFolder>
     <LangVersion>12</LangVersion>
     <NoWarn>$(NoWarn);1591</NoWarn>
+    <NuGetAudit>true</NuGetAudit>
+    <NuGetAuditLevel>low</NuGetAuditLevel>
+    <NuGetAuditMode>all</NuGetAuditMode>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(CI)' == 'true'">