build(deps-dev): bump phpunit/phpunit from 9.6.12 to 9.6.13

[dependabot[bot]]

Bumps phpunit/phpunit from 9.6.12 to 9.6.13.

Changelog

Sourced from phpunit/phpunit's changelog.

[9.6.13] - 2023-09-19

Changed

• The child processes used for process isolation now use temporary files to communicate their result to the parent process

Commits

• f3d767f Prepare release
• 304c1dd Merge branch '8.5' into 9.6
• 622d018 Prepare release
• 7a2f24f Merge branch '8.5' into 9.6
• fb1b6fa Update tools
• 9b37b06 Merge branch '8.5' into 9.6
• 3291172 The child processes used for process isolation now use temporary files to com...
• 33bbe51 Skip test on PHP >= 8.3, see https://github.com/sebastianbergmann/phpunit/iss...
• 2ce78bb Remove superfluous parent method calls
• e64a9dd Fix CS/WS issues
• Additional commits viewable in compare view

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