⬆️ Upgrade dependency phpunit/phpunit to v9.6.18

This MR contains the following updates:

Package	Type	Update	Change
phpunit/phpunit (source)	require-dev	patch	9.6.8 -> 9.6.18

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Release Notes

sebastianbergmann/phpunit (phpunit/phpunit)

v9.6.18: PHPUnit 9.6.18

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Changed

• #​5763: Release nullable type changes for PHPUnit 9.6

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How to install or update PHPUnit

v9.6.17

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v9.6.16

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v9.6.15

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v9.6.14

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v9.6.13

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v9.6.12

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v9.6.11

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v9.6.10

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v9.6.9

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