Update dependency phpunit/phpunit to v9.6.8

This MR contains the following updates:

Package	Type	Update	Change
phpunit/phpunit (source)	require-dev	minor	^10.0 -> ^9.6

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Release Notes

sebastianbergmann/phpunit

v9.6.8

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v9.6.7

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v9.6.6

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v9.6.5

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v9.6.4

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v9.6.3

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v9.6.2

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v9.6.1

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v9.6.0

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v9.5.28

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v9.5.27

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v9.5.26

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v9.5.25

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v9.5.24

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Configuration

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