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What is the problem that this PR is trying to fix?
shfmt
not up to date, the latest version has been release for about two months, should be good to update itWhat approach did you choose and why?
Download the latest release and check its checksum, update
cookbooks/travis_build_environment/attributes/default.rb
How can you make sure the change works as expected?
Just as how I did it many times before?
Would you like any additional feedback?
no
Reference
https://github.com/mvdan/sh/releases/tag/v3.9.0