Merge pull request #286 from wp-cli/add/phpstan #257

Job	Run time
code-quality / Spell check	7s
code-quality / Lint GitHub Actions workflows	8s
code-quality / Lint PHP files	15s
code-quality / Lint Gherkin Feature files	11s
code-quality / PHPCS	25s
code-quality / PHPStan	24s
	1m 30s

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