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Add "phpstan/extension-installer" to allowed plugins #211

Job	Run time
PHP 8.1, ubuntu-latest, prefer-lowest	15s
PHP 8.1, ubuntu-latest, prefer-stable	35s
PHP 8.1, macos-latest, prefer-lowest	1m 11s
PHP 8.1, macos-latest, prefer-stable	1m 14s
PHP 8.1, windows-latest, prefer-lowest	34s
PHP 8.1, windows-latest, prefer-stable	34s
PHP 8.2, ubuntu-latest, prefer-lowest	18s
PHP 8.2, ubuntu-latest, prefer-stable	12s
PHP 8.2, macos-latest, prefer-lowest	1m 17s
PHP 8.2, macos-latest, prefer-stable	1m 11s
PHP 8.2, windows-latest, prefer-lowest	40s
PHP 8.2, windows-latest, prefer-stable	49s
PHP 8.3, ubuntu-latest, prefer-lowest	11s
PHP 8.3, ubuntu-latest, prefer-stable	9s
PHP 8.3, macos-latest, prefer-lowest	1m 15s
PHP 8.3, macos-latest, prefer-stable	1m 7s
PHP 8.3, windows-latest, prefer-lowest	36s
PHP 8.3, windows-latest, prefer-stable	39s
PHP 8.4, ubuntu-latest, prefer-lowest	22s
PHP 8.4, ubuntu-latest, prefer-stable	11s
PHP 8.4, macos-latest, prefer-lowest	1m 23s
PHP 8.4, macos-latest, prefer-stable	1m 22s
PHP 8.4, windows-latest, prefer-lowest	33s
PHP 8.4, windows-latest, prefer-stable	30s
	17m 8s

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