bug: Fix Incorrect comparison in color-contrast function

[viniciusvts]

Update the conditional to correctly reflect the WCAG standard: the visual presentation of text and images of text has a contrast ratio of at least 4.5:1 (i.e., >= 4.5), not strictly greater than (>).

Type of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (non-breaking change)
• Breaking change (fix or feature that would change existing functionality)

Checklist

• I have read the contributing guidelines
• My code follows the code style of the project (using npm run lint)
• My change introduces changes to the documentation
• I have updated the documentation accordingly
• I have added tests to cover my changes
• All new and existing tests passed

Refs: #41543
Closes: #41543

[julien-deramond]

Could you please provide some before-and-after examples, including comparisons with other tools that implement this WCAG algorithm? This would help us review the proposed update. Please note that the need for updating the algorithm has not yet been discussed in the corresponding issue.

[julien-deramond]

Closing as superseded by #41585