PRs failing lint checks b/c editorconfig-checker upgrade required

[jwhitley]

[Lifting this to its own issue so it doesn't get lost. –J]

As noted in my comments on #334, editorconfig-checker is failing its lint check on the PR CI runs because it's scanning inside the .git directory and throwing a bunch of bogus errors as a result. An update to the editorconfig checker Docker image is required, to >=2.7.1. Might as well bump to latest release of 2.7.2. See editorconfig-checker/editorconfig-checker#268 for details.

[alerque]

Fixed in 937022f.

Hopefully the bump to release artifact tooling doesn't mess up our next release. I looked everything over for relevant changes but without trying it isn't always clear what might have broken when bumping these Actions.