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Add "phpstan/extension-installer" to allowed plugins #210

Job	Run time
PHP 8.1, ubuntu-latest, prefer-lowest	15s
PHP 8.1, ubuntu-latest, prefer-stable	21s
PHP 8.1, macos-latest, prefer-lowest	1m 10s
PHP 8.1, macos-latest, prefer-stable	1m 11s
PHP 8.1, windows-latest, prefer-lowest	35s
PHP 8.1, windows-latest, prefer-stable	35s
PHP 8.2, ubuntu-latest, prefer-lowest	9s
PHP 8.2, ubuntu-latest, prefer-stable	11s
PHP 8.2, macos-latest, prefer-lowest	1m 12s
PHP 8.2, macos-latest, prefer-stable	1m 22s
PHP 8.2, windows-latest, prefer-lowest	32s
PHP 8.2, windows-latest, prefer-stable	35s
PHP 8.3, ubuntu-latest, prefer-lowest	10s
PHP 8.3, ubuntu-latest, prefer-stable	17s
PHP 8.3, macos-latest, prefer-lowest	1m 22s
PHP 8.3, macos-latest, prefer-stable	1m 24s
PHP 8.3, windows-latest, prefer-lowest	37s
PHP 8.3, windows-latest, prefer-stable	30s
PHP 8.4, ubuntu-latest, prefer-lowest	15s
PHP 8.4, ubuntu-latest, prefer-stable	11s
PHP 8.4, macos-latest, prefer-lowest	1m 20s
PHP 8.4, macos-latest, prefer-stable	1m 18s
PHP 8.4, windows-latest, prefer-lowest	33s
PHP 8.4, windows-latest, prefer-stable	34s
	16m 39s

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