CI: cancel ongoing jobs on PR update

[pjonsson]

This cancels the running CI jobs when a PR gets updated, so the CI runners aren't occupied on testing something that is no longer relevant.

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📚 Documentation preview 📚: https://datacube-ows--1091.org.readthedocs.build/en/1091/

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 93.64%. Comparing base (82c9c77) to head (5c7ff23). Report is 3 commits behind head on master.

Additional details and impacted files

[](https://app.codecov.io/gh/opendatacube/datacube-ows/pull/1091?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=opendatacube) ```diff @@ Coverage Diff @@ ## master #1091 +/- ## ======================================= Coverage 93.64% 93.64% ======================================= Files 43 43 Lines 6510 6510 ======================================= Hits 6096 6096 Misses 414 414 ```

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