chore: Update Composer dev-deps and lint.

[justlevine]

What

This PR updates the composer dev-dependencies, and then runs phpcbf against the newly-discovered smells.

Why

WPGraphQL-CS 2.0.0-beta.3 fixes whitespace smell detection.

How

Testing Instructions

Additional Info

Checklist:

• [x] My code is tested to the best of my abilities.
• [x] My code follows the WordPress Coding Standards.
• [x] My code has proper inline documentation.
• [x] I have added unit tests to verify the code works as intended.
• [x] I included the relevant changes in CHANGELOG.md

[coveralls]

coverage: 82.619%. remained the same when pulling 8f93a06905734b69903df3af7fabfc6c17edaafb on justlevine:chore/update-phpcs into 6863d3e16da1e50560c5f37bb1d59df836901c45 on AxeWP:develop.