Update dependency phpunit/phpunit to v9.6.19

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
phpunit/phpunit (source)	9.5.23 -> 9.6.19

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Release Notes

sebastianbergmann/phpunit (phpunit/phpunit)

v9.6.19: PHPUnit 9.6.19

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Changed

• The namespaces of dependencies are now prefixed with PHPUnitPHAR instead of just PHPUnit for the PHAR distribution of PHPUnit

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How to install or update PHPUnit

v9.6.18

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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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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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