Merge branch 'cw/ci-whitespace' into maint-2.39

CI updates. We probably want a clean-up to move the long shell script embedded in yaml file into a separate file, but that can come later. * cw/ci-whitespace: ci (check-whitespace): move to actions/checkout@v3 ci (check-whitespace): add links to job output ci (check-whitespace): suggest fixes for errors