Update packages.config

Author: josesimoes

Tests/UnitTestsSerialPort/packages.config

@@ -1,9 +1,9 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="nanoFramework.CoreLibrary" version="1.12.0" targetFramework="netnanoframework10" />
   <package id="nanoFramework.Hardware.Esp32" version="1.3.6" targetFramework="netnanoframework10" />
   <package id="nanoFramework.Runtime.Events" version="1.10.0" targetFramework="netnanoframework10" />
   <package id="nanoFramework.System.IO.Streams" version="1.0.0" targetFramework="netnanoframework10" />
   <package id="nanoFramework.System.Text" version="1.1.3" targetFramework="netnanoframework10" />
   <package id="nanoFramework.TestFramework" version="1.0.185" targetFramework="netnanoframework10" developmentDependency="true" />
-</packages>
+</packages>