micropython: Update to v2.0.0-beta.1 release.

https://github.com/microbit-foundation/micropython-microbit-v2/releases/tag/v2.0.0-beta.1

Author: microbit-carlos

editor.html

@@ -74,7 +74,7 @@
             // VERSION INFORMATION
             EDITOR_VERSION = "2.1.0-beta.7";
             UPY_1_VERSION = "1.0.1";
-            UPY_2_VERSION = "2.0-44a75bb";
+            UPY_2_VERSION = "2.0.0-beta.1";
         </script>
         <script id="files-template" type="x-tmpl-mustache">
           <div id="files-modal" tabindex="-1" role="dialog" aria-label="load/save modal" aria-modal="true" class="modal-div">