Update 1 NuGet dependencies

Author: nfbot

samples/WiFiAP/WiFiAP.nfproj

@@ -43,7 +43,7 @@
   </ItemGroup>
   <ItemGroup>
     <Reference Include="Iot.Device.DhcpServer, Version=1.2.0.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>packages\nanoFramework.Iot.Device.DhcpServer.1.2.886\lib\Iot.Device.DhcpServer.dll</HintPath>
+      <HintPath>packages\nanoFramework.Iot.Device.DhcpServer.1.2.891\lib\Iot.Device.DhcpServer.dll</HintPath>
       <Private>True</Private>
     </Reference>
     <Reference Include="mscorlib, Version=1.17.11.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">

samples/WiFiAP/packages.config

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="nanoFramework.CoreLibrary" version="1.17.11" targetFramework="netnano1.0" />
-  <package id="nanoFramework.Iot.Device.DhcpServer" version="1.2.886" targetFramework="netnano1.0" />
+  <package id="nanoFramework.Iot.Device.DhcpServer" version="1.2.891" targetFramework="netnano1.0" />
   <package id="nanoFramework.ResourceManager" version="1.2.32" targetFramework="netnano1.0" />
   <package id="nanoFramework.Runtime.Events" version="1.11.32" targetFramework="netnano1.0" />
   <package id="nanoFramework.Runtime.Native" version="1.7.11" targetFramework="netnano1.0" />