Update 1 NuGet dependencies

Author: github-actions[bot]

Tests/M5Core2TestApp/M5Core2TestApp.nfproj

@@ -128,7 +128,7 @@
       <Private>True</Private>
     </Reference>
     <Reference Include="System.Net, Version=1.8.0.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\..\packages\nanoFramework.System.Net.1.8.0-preview.23\lib\System.Net.dll</HintPath>
+      <HintPath>..\..\packages\nanoFramework.System.Net.1.8.0-preview.26\lib\System.Net.dll</HintPath>
       <Private>True</Private>
     </Reference>
     <Reference Include="System.Numerics, Version=1.0.0.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">

Tests/M5Core2TestApp/packages.config

@@ -25,7 +25,7 @@
   <package id="nanoFramework.System.Diagnostics.Stopwatch" version="1.0.289-preview.1" targetFramework="netnanoframework10" />
   <package id="nanoFramework.System.IO.Ports" version="1.0.3-preview.23" targetFramework="netnanoframework10" />
   <package id="nanoFramework.System.Math" version="1.4.4-preview.13" targetFramework="netnanoframework10" />
-  <package id="nanoFramework.System.Net" version="1.8.0-preview.23" targetFramework="netnanoframework10" />
+  <package id="nanoFramework.System.Net" version="1.8.0-preview.26" targetFramework="netnanoframework10" />
   <package id="nanoFramework.System.Numerics" version="1.0.288-preview.49" targetFramework="netnanoframework10" />
   <package id="nanoFramework.System.Text" version="1.1.3-preview.13" targetFramework="netnanoframework10" />
   <package id="nanoFramework.System.Threading" version="1.0.4-preview.14" targetFramework="netnanoframework10" />