Update 1 NuGet dependencies

Author: nfbot

nanoFramework.Runtime.Native.nuspec

@@ -19,7 +19,7 @@
 This package requires a target with nanoFramework.Runtime.Native v$nativeVersion$ (checksum $checksum$).</description>
     <tags>nanoFramework C# csharp netmf netnf </tags>
     <dependencies>
-      <dependency id="nanoFramework.CoreLibrary" version="2.0.0-preview.4" />
+      <dependency id="nanoFramework.CoreLibrary" version="2.0.0-preview.6" />
     </dependencies>
   </metadata>
   <files>

nanoFramework.Runtime.Native/nanoFramework.Runtime.Native.nfproj

@@ -56,7 +56,7 @@
   </ItemGroup>
   <ItemGroup>
     <Reference Include="mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\packages\nanoFramework.CoreLibrary.2.0.0-preview.4\lib\netnano1.0\mscorlib.dll</HintPath>
+      <HintPath>..\packages\nanoFramework.CoreLibrary.2.0.0-preview.6\lib\netnano1.0\mscorlib.dll</HintPath>
     </Reference>
   </ItemGroup>
   <Import Project="$(NanoFrameworkProjectSystemPath)NFProjectSystem.CSharp.targets" Condition="Exists('$(NanoFrameworkProjectSystemPath)NFProjectSystem.CSharp.targets')" />

nanoFramework.Runtime.Native/packages.config

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="nanoFramework.CoreLibrary" version="2.0.0-preview.4" targetFramework="netnano1.0" />
+  <package id="nanoFramework.CoreLibrary" version="2.0.0-preview.6" targetFramework="netnano1.0" />
   <package id="Nerdbank.GitVersioning" version="3.7.115" developmentDependency="true" targetFramework="netnano1.0" />
 </packages>

nanoFramework.Runtime.Native/packages.lock.json

@@ -4,9 +4,9 @@
     ".NETnanoFramework,Version=v1.0": {
       "nanoFramework.CoreLibrary": {
         "type": "Direct",
-        "requested": "[2.0.0-preview.4, 2.0.0-preview.4]",
-        "resolved": "2.0.0-preview.4",
-        "contentHash": "am0Js4dpK0eVS609QW/6OQsmk96x7xVXUAk1Ca8vKpHx69fLCI523TuyKIWxnTp5U82FL+SQmRIdquSPDxXgHw=="
+        "requested": "[2.0.0-preview.6, 2.0.0-preview.6]",
+        "resolved": "2.0.0-preview.6",
+        "contentHash": "D5vzS/OGB3uYJHJoZd17Uf9M5+kKlnBcv5iUaNdjPZwO8yvj15Dhs21hpzaqV/SfLpcIPZB0i2OChxu+zgmmYA=="
       },
       "Nerdbank.GitVersioning": {
         "type": "Direct",