Update dependency wp-phpunit/wp-phpunit to ^6.6.2

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
wp-phpunit/wp-phpunit (source)	^6.4.2 -> ^6.6.2

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Release Notes

wp-phpunit/wp-phpunit (wp-phpunit/wp-phpunit)

v6.6.2

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v6.6.1

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v6.6.0

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v6.5.5

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v6.5.4

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v6.5.3

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v6.5.2

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v6.5.1

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v6.5.0

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v6.4.5

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v6.4.4

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v6.4.3

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