Cancel jobs from previous push

If one makes a lot of sequential pushes into specific branch, previous jobs still running, although in most time they are not needed. So, it would be nice to cancel them once a new push to branch for reducing CI usage.

There is an example how to cancel previous jobs:
https://github.com/NOAA-GFDL/FMS/blob/301b4fd70478f0cb0edef96b00b0deef3c1578dc/.github/workflows/github_cmake_gnu.yml#L6-L8