chore(deps-dev): bump phpunit/phpunit from 9.6.13 to 9.6.15

[dependabot[bot]]

Bumps phpunit/phpunit from 9.6.13 to 9.6.15.

Changelog

Sourced from phpunit/phpunit's changelog.

[9.6.15] - 2023-12-01

Fixed

• #5596: PHPUnit\Framework\TestCase has @internal annotation in PHAR

[9.6.14] - 2023-12-01

Added

• #5577: --composer-lock CLI option for PHAR binary that displays the composer.lock used to build the PHAR

Commits

• 05017b8 Prepare release
• 838af84 Merge branch '8.5' into 9.6
• 9652df5 Prepare release
• 3ba3e82 Pin humbug/php-scoper to 0.18.4 for #5596
• 43653e6 Prepare release
• c55b107 Merge branch '8.5' into 9.6
• c14b7dc Prepare release
• 7000410 Merge branch '8.5' into 9.6
• 539165b Revert "Ensure that dependencies are up-to-date"
• 75922e1 Use "composer outdated" instead of "composer show" (because PHPUnit >= 9.6 do...
• Additional commits viewable in compare view

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Superseded by #168.