Configure arduino/compile-sketches CI action to do authenticated API requests

The arduino/compile-sketches GitHub Actions action needs to do a GitHub API request to determine the base branch of a PR
for the deltas determination. If a token is not defined via the action's `github-token` input, it does an
unauthenticated API request, which is subject to more strict rate limiting policy. Although its unlikely for the number
of API requests to exceed the unauthentticated allowance, use of a token ensures it will never happen. GitHub Actions
provides a token for this purpose, so there is no need to set up a custom one.

Author: per1234

.github/workflows/compile-examples.yml

@@ -70,6 +70,7 @@ jobs:
       - name: Compile examples
         uses: arduino/compile-sketches@main
         with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
           fqbn: ${{ matrix.board.fqbn }}
           libraries: |
             ${{ env.UNIVERSAL_LIBRARIES }}