feat(axe-core-4.2.1): update axe-core, ai-scan, and ai-report packages together

[dbjorge]

Details

Updates axe-core, accessibility-insights-scan, and accessibility-insights-report packages together to match versions in use in web/service.

Motivation

Keep action ruleset synced with web/service

Context

n/a

Pull request checklist

• [n/a] Addresses an existing issue: Fixes #0000
• [n/a] Added relevant unit test for your changes. (yarn test)
• [n/a] Verified code coverage for the changes made. Check coverage report at: <rootDir>/test-results/unit/coverage
• Ran precheckin (yarn precheckin)
• (after PR created) The Accessibility Checks (pull_request) check should fail. All other checks should pass.

[github-actions]

Accessibility Insights Action

• URLs: 1 URL(s) failed, 3 URL(s) passed, and 0 were not scannable
• Rules: 5 check(s) failed, 11 check(s) passed, and 39 were not applicable
• Download the Accessibility Insights artifact to view the detailed results of these checks

Failed instances

• 3 × label: Ensures every form element has a label
• 1 × html-has-lang: Ensures every HTML document has a lang attribute
• 1 × image-alt: Ensures elements have alternate text or a role of none or presentation

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This scan used axe-core 4.2.1 with Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.75 Safari/537.36.

[dbjorge]

Note: the checks section shows "all checks have passed" incorrectly due to #631 in combination with #629