chore(deps): update dependency phpunit/phpunit to v9.5.21

This MR contains the following updates:

Package	Type	Update	Change
phpunit/phpunit (source)	require-dev	patch	9.5.20 -> 9.5.21

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Release Notes

sebastianbergmann/phpunit

v9.5.21

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This MR has been generated by Renovate Bot.

added renovate label

enabled an automatic merge when the pipeline for 29ac323d succeeds

mentioned in issue #1 (closed)

mentioned in commit d9a6d35c

merged