Bump phpunit/phpunit from 10.0.14 to 10.0.15

Bumps phpunit/phpunit from 10.0.14 to 10.0.15.

Changelog

Sourced from phpunit/phpunit's changelog.

[10.0.15] - 2023-03-09

Changed

• Improved the HTML and CSS for the output of --testdox-html

Fixed

• Fixed some inconsistencies in expectation failure messages
• Restored errors when multiple @coversDefaultClass and/or @usesDefaultClass annotations are used

Commits

• 9b0c224 Prepare release
• 537bfe3 Merge branch '9.6' into 10.0
• 86e7619 Prepare release
• 0ed4460 Merge branch '9.6' into 10.0
• 3d685bb Backport TestDox HTML improvements
• 7533a31 Update expectation
• 9088c98 Underline class names
• 5f5947a Simplify
• 26b0037 Avoid duplicate list elements
• b1de073 Reorganize
• Additional commits viewable in compare view

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