Update 1 nuget dependencies

Author: github-actions[bot]

nanoFramework.Graphics.nuspec

@@ -20,7 +20,7 @@
       This package requires a target with nanoFramework.Networking.Sntp v$nativeVersion$ (checksum $checksum$).</description>
     <tags>nanoFramework C# csharp netmf netnf nanoFramework.Graphics</tags>
     <dependencies>
-      <dependency id="nanoFramework.CoreLibrary" version="1.10.3-preview.7" />
+      <dependency id="nanoFramework.CoreLibrary" version="1.10.3-preview.20" />
       <dependency id="nanoFramework.ResourceManager" version="1.1.2-preview.29" />
       <dependency id="nanoFramework.Runtime.Events" version="1.9.0-preview.16" />
       <dependency id="nanoFramework.Runtime.Native" version="1.5.1-preview.32" />

nanoFramework.Graphics/nanoFramework.Graphics.nfproj

@@ -38,7 +38,7 @@
     </NFMDP_PE_ExcludeClassByName>
   </ItemGroup>
   <ItemGroup>
-    <NFMDP_PE_LoadHints Include="..\packages\nanoFramework.CoreLibrary.1.10.3-preview.7\lib\mscorlib.dll">
+    <NFMDP_PE_LoadHints Include="..\packages\nanoFramework.CoreLibrary.1.10.3-preview.20\lib\mscorlib.dll">
       <InProject>false</InProject>
     </NFMDP_PE_LoadHints>
     <NFMDP_PE_LoadHints Include="..\packages\nanoFramework.ResourceManager.1.1.2-preview.29\lib\nanoFramework.ResourceManager.dll">
@@ -171,7 +171,7 @@
   </ItemGroup>
   <ItemGroup>
     <Reference Include="mscorlib, Version=1.10.3.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\packages\nanoFramework.CoreLibrary.1.10.3-preview.7\lib\mscorlib.dll</HintPath>
+      <HintPath>..\packages\nanoFramework.CoreLibrary.1.10.3-preview.20\lib\mscorlib.dll</HintPath>
       <Private>True</Private>
     </Reference>
     <Reference Include="nanoFramework.ResourceManager, Version=1.1.2.0, Culture=neutral, PublicKeyToken=c07d481e9758c731">

nanoFramework.Graphics/packages.config

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="nanoFramework.CoreLibrary" version="1.10.3-preview.7" targetFramework="netnanoframework10" />
+  <package id="nanoFramework.CoreLibrary" version="1.10.3-preview.20" targetFramework="netnanoframework10" />
   <package id="nanoFramework.ResourceManager" version="1.1.2-preview.29" targetFramework="netnanoframework10" />
   <package id="nanoFramework.Runtime.Events" version="1.9.0-preview.16" targetFramework="netnanoframework10" />
   <package id="nanoFramework.Runtime.Native" version="1.5.1-preview.32" targetFramework="netnanoframework10" />