fix dperecated warning message

Author: Bertk

Directory.Packages.props

@@ -47,7 +47,7 @@
     <PackageVersion Include="System.Collections.Immutable" Version="8.0.0" />
     <PackageVersion Include="System.Configuration.ConfigurationManager" Version="8.0.0" />
     <PackageVersion Include="System.Diagnostics.EventLog" Version="8.0.2" />
-    <PackageVersion Include="System.Linq.Async" Version="6.0.1" />
+    <PackageVersion Include="System.Linq.Async" Version="6.0.3" />
     <PackageVersion Include="System.Memory" Version="4.6.3" />
     <PackageVersion Include="System.Net.Http" Version="4.3.4" />
     <PackageVersion Include="System.Reflection.Metadata" Version="8.0.1" />