Update name of action used to compile examples in CI workflow

The action has been moved to a dedicated repository, where all future development work will happen.

Author: per1234

.github/workflows/compile-examples.yml

@@ -15,7 +15,7 @@ jobs:
 
    steps:
      - uses: actions/checkout@v2
-     - uses: arduino/actions/libraries/compile-examples@master
+     - uses: arduino/compile-sketches@v1
        with:
         github-token: ${{ secrets.GITHUB_TOKEN }}
          fqbn: ${{ matrix.fqbn }}