Bump phpunit/phpunit from 9.5.5 to 9.5.6

[dependabot[bot]]

Bumps phpunit/phpunit from 9.5.5 to 9.5.6.

Changelog

Sourced from phpunit/phpunit's changelog.

[9.5.6] - 2021-06-23

Changed

• PHPUnit now errors out on startup when PHP_VERSION contains a value that is not compatible with version_compare(), for instance X.Y.Z-(to be removed in future macOS)

Commits

• fb9b833 Prepare release
• 2fecea8 Merge branch '8.5' into 9.5
• 7906785 Prepare release
• e2d1e0b Update ChangeLog
• 26841eb Merge branch '8.5' into 9.5
• ba4d1ab Update ChangeLog
• de43725 Merge branch '8.5' into 9.5
• d5bcfa4 Sync
• f8e2af4 Fix CS/WS issue
• 2582385 Handle invalid PHP version strings
• Additional commits viewable in compare view

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[dependabot[bot]]

Looks like phpunit/phpunit is up-to-date now, so this is no longer needed.