CI: add API key to increase rate limit of installing protoc

Author: drmingdrmer

.github/workflows/ci.yaml

@@ -434,6 +434,7 @@ jobs:
         uses: arduino/setup-protoc@v3
         with:
           version: '23.x'
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
 
       # Run the following steps in the exmple dir in order to reuse the `./target` dir.