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

Job	Run time
PHP 8.1, ubuntu-latest, prefer-lowest	13s
PHP 8.1, ubuntu-latest, prefer-stable	18s
PHP 8.1, macos-latest, prefer-lowest	1m 19s
PHP 8.1, macos-latest, prefer-stable	1m 31s
PHP 8.1, windows-latest, prefer-lowest	32s
PHP 8.1, windows-latest, prefer-stable	33s
PHP 8.2, ubuntu-latest, prefer-lowest	11s
PHP 8.2, ubuntu-latest, prefer-stable	25s
PHP 8.2, macos-latest, prefer-lowest	1m 19s
PHP 8.2, macos-latest, prefer-stable	1m 28s
PHP 8.2, windows-latest, prefer-lowest	41s
PHP 8.2, windows-latest, prefer-stable	38s
PHP 8.3, ubuntu-latest, prefer-lowest	20s
PHP 8.3, ubuntu-latest, prefer-stable	9s
PHP 8.3, macos-latest, prefer-lowest	1m 6s
PHP 8.3, macos-latest, prefer-stable	1m 6s
PHP 8.3, windows-latest, prefer-lowest	29s
PHP 8.3, windows-latest, prefer-stable	38s
PHP 8.4, ubuntu-latest, prefer-lowest	11s
PHP 8.4, ubuntu-latest, prefer-stable	15s
PHP 8.4, macos-latest, prefer-lowest	1m 37s
PHP 8.4, macos-latest, prefer-stable	1m 8s
PHP 8.4, windows-latest, prefer-lowest	34s
PHP 8.4, windows-latest, prefer-stable	45s
	17m 26s

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