Since the most advanced code of the ArduinoCore-API repository now reside within the master branch we should check that one out instead of the outdated branch namespace_arduino. (arduino#98)

Author: aentinger

Diff for: .github/workflows/compile-examples.yml

@@ -56,7 +56,6 @@ jobs:
         uses: actions/checkout@v2
         with:
           repository: arduino/ArduinoCore-API
-          ref: namespace_arduino
           path: ArduinoCore-API
 
       - name: Remove old symlink to api