Update 2 NuGet dependencies

Author: github-actions[bot]

nanoFramework.WebServer.nuspec

@@ -25,8 +25,8 @@ Supports both HTTPS and HTTP.</description>
       <dependency id="nanoFramework.Runtime.Events" version="1.10.0" />
       <dependency id="nanoFramework.System.Collections" version="1.4.0" />
       <dependency id="nanoFramework.System.Text" version="1.1.3-preview.4" />
-      <dependency id="nanoFramework.System.Net" version="1.8.1-preview.5" />
-      <dependency id="nanoFramework.System.Net.Http.Server" version="1.4.0-preview.51" />
+      <dependency id="nanoFramework.System.Net" version="1.8.1" />
+      <dependency id="nanoFramework.System.Net.Http.Server" version="1.4.0-preview.52" />
       <dependency id="nanoFramework.Windows.Storage" version="1.4.6-preview.48" />
       <dependency id="nanoFramework.Windows.Storage.Streams" version="1.12.4-preview.19" />
       <dependency id="nanoFramework.System.Threading" version="1.0.4-preview.6" />

nanoFramework.WebServer/nanoFramework.WebServer.nfproj

@@ -64,12 +64,12 @@
       <HintPath>..\packages\nanoFramework.System.IO.Streams.1.0.0\lib\System.IO.Streams.dll</HintPath>
       <Private>True</Private>
     </Reference>
-    <Reference Include="System.Net, Version=1.8.1.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\packages\nanoFramework.System.Net.1.8.1-preview.5\lib\System.Net.dll</HintPath>
+    <Reference Include="System.Net, Version=1.8.1.3, Culture=neutral, PublicKeyToken=c07d481e9758c731">
+      <HintPath>..\packages\nanoFramework.System.Net.1.8.1\lib\System.Net.dll</HintPath>
       <Private>True</Private>
     </Reference>
     <Reference Include="System.Net.Http, Version=1.4.0.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\packages\nanoFramework.System.Net.Http.Server.1.4.0-preview.51\lib\System.Net.Http.dll</HintPath>
+      <HintPath>..\packages\nanoFramework.System.Net.Http.Server.1.4.0-preview.52\lib\System.Net.Http.dll</HintPath>
       <Private>True</Private>
     </Reference>
     <Reference Include="System.Threading, Version=1.0.4.3, Culture=neutral, PublicKeyToken=c07d481e9758c731">

nanoFramework.WebServer/packages.config

@@ -4,8 +4,8 @@
   <package id="nanoFramework.Runtime.Events" version="1.10.0" targetFramework="netnanoframework10" />
   <package id="nanoFramework.System.Collections" version="1.4.0" targetFramework="netnanoframework10" />
   <package id="nanoFramework.System.IO.Streams" version="1.0.0" />
-  <package id="nanoFramework.System.Net" version="1.8.1-preview.5" targetFramework="netnanoframework10" />
-  <package id="nanoFramework.System.Net.Http.Server" version="1.4.0-preview.51" targetFramework="netnanoframework10" />
+  <package id="nanoFramework.System.Net" version="1.8.1" targetFramework="netnanoframework10" />
+  <package id="nanoFramework.System.Net.Http.Server" version="1.4.0-preview.52" targetFramework="netnanoframework10" />
   <package id="nanoFramework.System.Text" version="1.1.3" targetFramework="netnanoframework10" />
   <package id="nanoFramework.System.Threading" version="1.0.4" />
   <package id="nanoFramework.Windows.Storage" version="1.4.6-preview.48" targetFramework="netnanoframework10" />