Update 1 NuGet dependencies

***NO_CI***

Author: nfbot

System.IO.Ports/System.IO.Ports.nfproj

@@ -62,19 +62,15 @@
   <ItemGroup>
     <Reference Include="mscorlib, Version=1.15.6.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
       <HintPath>..\packages\nanoFramework.CoreLibrary.1.15.5\lib\mscorlib.dll</HintPath>
-      <Private>True</Private>
     </Reference>
     <Reference Include="nanoFramework.Runtime.Events, Version=1.11.18.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
       <HintPath>..\packages\nanoFramework.Runtime.Events.1.11.18\lib\nanoFramework.Runtime.Events.dll</HintPath>
-      <Private>True</Private>
     </Reference>
     <Reference Include="nanoFramework.System.Text, Version=1.2.54.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
       <HintPath>..\packages\nanoFramework.System.Text.1.2.54\lib\nanoFramework.System.Text.dll</HintPath>
-      <Private>True</Private>
     </Reference>
     <Reference Include="System.IO.Streams, Version=1.1.59.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
       <HintPath>..\packages\nanoFramework.System.IO.Streams.1.1.59\lib\System.IO.Streams.dll</HintPath>
-      <Private>True</Private>
     </Reference>
   </ItemGroup>
   <Import Project="$(NanoFrameworkProjectSystemPath)NFProjectSystem.CSharp.targets" Condition="Exists('$(NanoFrameworkProjectSystemPath)NFProjectSystem.CSharp.targets')" />

Tests/UnitTestsSerialPort/UnitTestsSerialPort.nfproj

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="Current" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup Label="Globals">
     <NanoFrameworkProjectSystemPath>$(MSBuildExtensionsPath)\nanoFramework\v1.0\</NanoFrameworkProjectSystemPath>
@@ -42,31 +42,24 @@
   <ItemGroup>
     <Reference Include="mscorlib, Version=1.15.6.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
       <HintPath>..\..\packages\nanoFramework.CoreLibrary.1.15.5\lib\mscorlib.dll</HintPath>
-      <Private>True</Private>
     </Reference>
-    <Reference Include="nanoFramework.Hardware.Esp32, Version=1.6.15.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\..\packages\nanoFramework.Hardware.Esp32.1.6.15\lib\nanoFramework.Hardware.Esp32.dll</HintPath>
-      <Private>True</Private>
+    <Reference Include="nanoFramework.Hardware.Esp32, Version=1.6.19.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
+      <HintPath>..\..\packages\nanoFramework.Hardware.Esp32.1.6.19\lib\nanoFramework.Hardware.Esp32.dll</HintPath>
     </Reference>
     <Reference Include="nanoFramework.Runtime.Events, Version=1.11.18.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
       <HintPath>..\..\packages\nanoFramework.Runtime.Events.1.11.18\lib\nanoFramework.Runtime.Events.dll</HintPath>
-      <Private>True</Private>
     </Reference>
     <Reference Include="nanoFramework.System.Text, Version=1.2.54.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
       <HintPath>..\..\packages\nanoFramework.System.Text.1.2.54\lib\nanoFramework.System.Text.dll</HintPath>
-      <Private>True</Private>
     </Reference>
     <Reference Include="nanoFramework.TestFramework, Version=2.1.107.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
       <HintPath>..\..\packages\nanoFramework.TestFramework.2.1.107\lib\nanoFramework.TestFramework.dll</HintPath>
-      <Private>True</Private>
     </Reference>
     <Reference Include="nanoFramework.UnitTestLauncher, Version=0.0.0.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
       <HintPath>..\..\packages\nanoFramework.TestFramework.2.1.107\lib\nanoFramework.UnitTestLauncher.exe</HintPath>
-      <Private>True</Private>
     </Reference>
     <Reference Include="System.IO.Streams, Version=1.1.59.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
       <HintPath>..\..\packages\nanoFramework.System.IO.Streams.1.1.59\lib\System.IO.Streams.dll</HintPath>
-      <Private>True</Private>
     </Reference>
   </ItemGroup>
   <Import Project="$(NanoFrameworkProjectSystemPath)NFProjectSystem.CSharp.targets" Condition="Exists('$(NanoFrameworkProjectSystemPath)NFProjectSystem.CSharp.targets')" />

Tests/UnitTestsSerialPort/packages.config

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="nanoFramework.CoreLibrary" version="1.15.5" targetFramework="netnano1.0" />
-  <package id="nanoFramework.Hardware.Esp32" version="1.6.15" targetFramework="netnano1.0" />
+  <package id="nanoFramework.Hardware.Esp32" version="1.6.19" targetFramework="netnano1.0" />
   <package id="nanoFramework.Runtime.Events" version="1.11.18" targetFramework="netnano1.0" />
   <package id="nanoFramework.System.IO.Streams" version="1.1.59" targetFramework="netnano1.0" />
   <package id="nanoFramework.System.Text" version="1.2.54" targetFramework="netnano1.0" />

Tests/UnitTestsSerialPort/packages.lock.json

@@ -10,9 +10,9 @@
       },
       "nanoFramework.Hardware.Esp32": {
         "type": "Direct",
-        "requested": "[1.6.15, 1.6.15]",
-        "resolved": "1.6.15",
-        "contentHash": "6rHNyfZ2mHEq5Kwwx4Xpf3IezTQxfSrI159CKiG4MxQZi8E0VPrRLbyUIXDrNBiz0/VCmeBAKpqv9foJmixCLA=="
+        "requested": "[1.6.19, 1.6.19]",
+        "resolved": "1.6.19",
+        "contentHash": "dvLEvudRQ/89GtX8i/flOwb81vCMVvI3PpQ+B07b/TUz4tAvpwA7iw6ye5224Z/8j3CQBhefiZtU/jv6K7HRyw=="
       },
       "nanoFramework.Runtime.Events": {
         "type": "Direct",