Cancel previous similar CI tasks when a new commit pushed

So far, any GitHub Actions task will run until finish no matter whether a new commit pushed, which mean almost the previous version is discarded and no need to test.

GitHub Actions itself can cancel previous tasks of the same PR using:

concurrency: 
  group: ${{ github.ref }}-${{ github.workflow }}
  cancel-in-progress: true

I suggest we just apply this setting to avoid redundant tasks running.