chore(ci): test ats with 8.4

[Patrick Weyck (pweyck)]

1. Why is this change necessary?

2. What does this change do, exactly?

3. Describe each step to reproduce the issue or behaviour.

4. Please link to the relevant issues (if any).

5. Checklist

• I have written tests and verified that they fail without my change
• I have created a changelog file with all necessary information about my changes
• I have written or adjusted the documentation according to my changes
• This change has comments for package types, values, functions, and non-obvious lines of code
• I have read the contribution requirements and fulfill them.

[github-actions]

	Warnings
⚠️	The Pull Request doesn't contain any changelog file

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 50.21%. Comparing base (e41888e) to head (e87e639).
Report is 5 commits behind head on trunk.

Additional details and impacted files

@@            Coverage Diff             @@
##            trunk    #6270      +/-   ##
==========================================
- Coverage   50.21%   50.21%   -0.01%     
==========================================
  Files        4801     4801              
  Lines      163976   163972       -4     
  Branches     9177     9177              
==========================================
- Hits        82345    82341       -4     
  Misses      78853    78853              
  Partials     2778     2778              

Flag	Coverage Δ
jest-admin	59.29% <ø> (ø)
jest-storefront	67.28% <ø> (ø)
phpunit-migration	38.63% <ø> (ø)
phpunit-unit	41.86% <ø> (-0.01%)	⬇️

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