Upgrade to Stylelint 16

[connor-baer]

Purpose

https://github.com/stylelint/stylelint/blob/main/CHANGELOG.md#1600

Approach and changes

• Upgrade to Stylelint 16 and update all Stylelint plugins to ensure their compatibility

Definition of done

• Development completed
• Reviewers assigned
• Unit and integration tests

[changeset-bot]

🦋 Changeset detected

Latest commit: 6c2f5b5

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@sumup/foundry	Major

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d8fdc57) 63.93% compared to head (04d20df) 63.93%.

❗ Current head 04d20df differs from pull request most recent head 6c2f5b5. Consider uploading reports for the commit 6c2f5b5 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             next     #926   +/-   ##
=======================================
  Coverage   63.93%   63.93%           
=======================================
  Files          29       29           
  Lines        2257     2257           
  Branches      122      122           
=======================================
  Hits         1443     1443           
  Misses        804      804           
  Partials       10       10           

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