Update 1 NuGet dependencies

Author: github-actions[bot]

Tests/MagicBitTestApp/MagicBitTestApp.nfproj

@@ -75,7 +75,7 @@
       <Private>True</Private>
     </Reference>
     <Reference Include="System.Threading, Version=1.0.4.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\..\packages\nanoFramework.System.Threading.1.0.4-preview.6\lib\System.Threading.dll</HintPath>
+      <HintPath>..\..\packages\nanoFramework.System.Threading.1.0.4-preview.8\lib\System.Threading.dll</HintPath>
       <Private>True</Private>
     </Reference>
     <Reference Include="UnitsNet.Frequency, Version=4.113.0.0, Culture=neutral, PublicKeyToken=null">

Tests/MagicBitTestApp/packages.config

@@ -13,6 +13,6 @@
   <package id="nanoFramework.System.Device.Model" version="1.0.259" targetFramework="netnanoframework10" />
   <package id="nanoFramework.System.Device.Pwm" version="1.0.1-preview.4" targetFramework="netnanoframework10" />
   <package id="nanoFramework.System.Math" version="1.4.4-preview.5" targetFramework="netnanoframework10" />
-  <package id="nanoFramework.System.Threading" version="1.0.4-preview.6" targetFramework="netnanoframework10" />
+  <package id="nanoFramework.System.Threading" version="1.0.4-preview.8" targetFramework="netnanoframework10" />
   <package id="UnitsNet.nanoFramework.Frequency" version="4.113.0" targetFramework="netnanoframework10" />
 </packages>