Bump phpunit/phpunit from 8.5.2 to 8.5.3

Bumps [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) from 8.5.2 to 8.5.3.
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/master/ChangeLog-8.5.md)
- [Commits](sebastianbergmann/phpunit@8.5.2...8.5.3)

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