Update copyright headers

***NO_CI***

Author: josesimoes

.github/workflows/update-dependencies.yml

@@ -1,4 +1,4 @@
-# Copyright (c) 2020 The nanoFramework project contributors
+# Copyright (c) .NET Foundation and Contributors
 # See LICENSE file in the project root for full license information.
 
 # This workflow will periodically check .NET nanoFramework dependencies and updates them in the repository it's running.

nanoFramework.Networking.Sntp.DELIVERABLES.nuspec

@@ -12,7 +12,7 @@
     <developmentDependency>false</developmentDependency>
     <projectUrl>https://github.com/nanoframework/lib-nanoFramework.Networking.Sntp</projectUrl>
     <iconUrl>https://secure.gravatar.com/avatar/97d0e092247f0716db6d4b47b7d1d1ad</iconUrl>
-    <copyright>Copyright (c) 2018 The nanoFramework project contributors</copyright>
+    <copyright>Copyright (c) .NET Foundation and Contributors</copyright>
     <description>** DON'T REFERENCE THIS PACKAGE ** Not meant for development. This package includes the deliverable artifacts of the nanoFramework.Networking.Sntp assembly for nanoFramework. These are for testing purposes and for updating the native code base of the library.</description>
     <summary>nanoFramework.Networking.Sntp.DELIVERABLES is not meant for development.</summary>
     <tags>

nanoFramework.Networking.Sntp/Properties/AssemblyInfo.cs

@@ -7,7 +7,7 @@
 [assembly: AssemblyTitle("nanoFramework.Networking.Sntp")]
 [assembly: AssemblyCompany("nanoFramework Contributors")]
 [assembly: AssemblyProduct("nanoFramework.Networking.Sntp")]
-[assembly: AssemblyCopyright("Copyright © nanoFramework Contributors 2018")]
+[assembly: AssemblyCopyright("Copyright (c) .NET Foundation and Contributors")]
 
 ////////////////////////////////////////////////////////////////
 // update this whenever the native assembly signature changes //