Update 1 nuget dependencies

Author: github-actions[bot]

nanoFramework.WebServer.nuspec

@@ -28,7 +28,7 @@
       <dependency id="nanoFramework.System.Collections" version="1.2.0-preview.36" />
       <dependency id="nanoFramework.System.Text" version="1.1.1-preview.35" />
       <dependency id="nanoFramework.System.Net" version="1.6.5-preview.2" />
-      <dependency id="nanoFramework.System.Net.Http.Server" version="1.3.4-alpha.188.6" />
+      <dependency id="nanoFramework.System.Net.Http.Server" version="1.3.4-preview.7" />
       <dependency id="nanoFramework.Windows.Storage" version="1.4.4-preview.53" />
       <dependency id="nanoFramework.Windows.Storage.Streams" version="1.10.1-preview.28" />
     </dependencies>

nanoFramework.WebServer/nanoFramework.WebServer.nfproj

@@ -65,7 +65,7 @@
       <Private>True</Private>
     </Reference>
     <Reference Include="System.Net.Http, Version=1.3.4.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\packages\nanoFramework.System.Net.Http.Server.1.3.4-alpha.188.6\lib\System.Net.Http.dll</HintPath>
+      <HintPath>..\packages\nanoFramework.System.Net.Http.Server.1.3.4-preview.7\lib\System.Net.Http.dll</HintPath>
       <Private>True</Private>
     </Reference>
     <Reference Include="Windows.Storage, Version=1.4.4.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">

nanoFramework.WebServer/packages.config

@@ -4,7 +4,7 @@
   <package id="nanoFramework.Runtime.Events" version="1.9.0-preview.16" targetFramework="netnanoframework10" />
   <package id="nanoFramework.System.Collections" version="1.2.0-preview.36" targetFramework="netnanoframework10" />
   <package id="nanoFramework.System.Net" version="1.6.5-preview.2" targetFramework="netnanoframework10" />
-  <package id="nanoFramework.System.Net.Http.Server" version="1.3.4-alpha.188.6" targetFramework="netnanoframework10" />
+  <package id="nanoFramework.System.Net.Http.Server" version="1.3.4-preview.7" targetFramework="netnanoframework10" />
   <package id="nanoFramework.System.Text" version="1.1.1-preview.35" targetFramework="netnanoframework10" />
   <package id="nanoFramework.Windows.Storage" version="1.4.4-preview.53" targetFramework="netnanoframework10" />
   <package id="nanoFramework.Windows.Storage.Streams" version="1.10.1-preview.28" targetFramework="netnanoframework10" />