Build

Upgrade to PHPStan 2.x #2439

Job	Run time
linter	37s
phpstan	27s
phpunit (macos-latest, 8.4, 7.2, stable)	1m 57s
phpunit (windows-latest, 8.4, 7.2, stable)	1m 27s
phpunit (macos-latest, 8.4, 6.4, stable)	2m 19s
phpunit (windows-latest, 8.4, 6.4, stable)	1m 31s
phpunit (ubuntu-latest, 8.1, --prefer-lowest, stable)	29s
phpunit (ubuntu-latest, 8.1, 5.4, stable)	30s
phpunit (ubuntu-latest, 8.2, 6.4, stable)	25s
phpunit (ubuntu-latest, 8.3, 7.1, stable)	31s
phpunit (ubuntu-latest, 8.4, 7.1, stable)	33s
phpunit (ubuntu-latest, 8.4, 7.2, stable)	49s
	11m 35s

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