chore(project): update accessibility-checker to 4.0.6

[tay1orjones]

This brings in this fix: IBMa/equal-access#2248

Previously versioned wasn't actually locking the ruleset and was just grabbing the latest. This should ensure the ruleset in use doesn't change until we update accessibility-checker

Changelog

Changed

• update accessibility-checker to 4.0.4, waiting on 4.0.6 slated for end of June
  • [BUG]: tests fail in jest and jsdom -fetch is not defined IBMa/equal-access#2283
  • https://www.npmjs.com/package/accessibility-checker?activeTab=versions

Testing / Reviewing

• Double check the a11y status check logs to make sure nothing looks wrong

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[tay1orjones]

The unit/jest tests that call toHaveNoACViolations are failing because accessibility-checker removed axios in favor of using fetch directly. Unfortunately jsdom does not include fetch, jsdom/jsdom#1724

Options, in order of my preference:

• Wait for an upstream fix: [BUG]: tests fail in jest and jsdom -fetch is not defined IBMa/equal-access#2283
• Disable/remove these tests (do we have parity with the newer playwright a11y tests?)
• Polyfill it on our own

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.07%. Comparing base (644b34f) to head (a1d08e6).
Report is 12 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #19251   +/-   ##
=======================================
  Coverage   91.07%   91.07%           
=======================================
  Files         476      476           
  Lines       29753    29753           
  Branches     5393     5344   -49     
=======================================
  Hits        27098    27098           
  Misses       2502     2502           
  Partials      153      153           

Flag	Coverage Δ
main-packages	84.87% <ø> (ø)
web-components	97.16% <ø> (ø)

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[2nikhiltom]

a11y checks LGTM

[heloiselui]

LGTM