Revert "Temporarily swap boards branch to migrate-4mb-to-esptool"

This reverts commit 860822a.

Author: tyeth

.github/workflows/build-clang-doxy.yml

@@ -83,7 +83,6 @@ jobs:
         with:
           repository: adafruit/Wippersnapper_Boards
           path: ws-boards
-          ref: migrate-4mb-to-esptool
       - name: Install CI-Arduino
         run: bash ci/actions_install.sh
       - name: Install extra Arduino libraries