Upgraded DnsClient.NET library to version 1.4.0

Author: jorik

src/MongoDB.Driver.Core/MongoDB.Driver.Core.csproj

@@ -124,7 +124,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="DnsClient" Version="1.3.1" />
+    <PackageReference Include="DnsClient" Version="1.4.0" />
     <PackageReference Include="Microsoft.CodeAnalysis.FxCopAnalyzers" Version="2.6.2" PrivateAssets="All" />
     <PackageReference Include="MongoDB.Libmongocrypt" Version="1.2.0" />
     <PackageReference Include="SharpCompress" Version="0.23.0" />