Update 4 NuGet dependencies

Author: github-actions[bot]

System.IO.Ports/packages.config

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="nanoFramework.CoreLibrary" version="1.12.0-preview.9" targetFramework="netnanoframework10" />
   <package id="nanoFramework.Runtime.Events" version="1.10.0-preview.8" targetFramework="netnanoframework10" />

Tests/UnitTestsSerialPort/UnitTestsSerialPort.nfproj

@@ -43,7 +43,7 @@
       <Private>True</Private>
     </Reference>
     <Reference Include="nanoFramework.Hardware.Esp32, Version=1.3.5.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\..\packages\nanoFramework.Hardware.Esp32.1.3.5-preview.6\lib\nanoFramework.Hardware.Esp32.dll</HintPath>
+      <HintPath>..\..\packages\nanoFramework.Hardware.Esp32.1.3.5-preview.7\lib\nanoFramework.Hardware.Esp32.dll</HintPath>
       <Private>True</Private>
     </Reference>
     <Reference Include="nanoFramework.Runtime.Events, Version=1.10.0.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">

Tests/UnitTestsSerialPort/packages.config

@@ -1,7 +1,7 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="nanoFramework.CoreLibrary" version="1.12.0-preview.9" targetFramework="netnanoframework10" />
-  <package id="nanoFramework.Hardware.Esp32" version="1.3.5-preview.6" targetFramework="netnanoframework10" />
+  <package id="nanoFramework.Hardware.Esp32" version="1.3.5-preview.7" targetFramework="netnanoframework10" />
   <package id="nanoFramework.Runtime.Events" version="1.10.0-preview.8" targetFramework="netnanoframework10" />
   <package id="nanoFramework.System.IO.Streams" version="1.0.0-preview.12" targetFramework="netnanoframework10" />
   <package id="nanoFramework.System.Text" version="1.1.3-preview.15" targetFramework="netnanoframework10" />