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Add "phpstan/extension-installer" to allowed plugins #213

Job	Run time
PHP 8.1, ubuntu-latest, prefer-lowest	15s
PHP 8.1, ubuntu-latest, prefer-stable	14s
PHP 8.1, macos-latest, prefer-lowest	1m 16s
PHP 8.1, macos-latest, prefer-stable	1m 21s
PHP 8.1, windows-latest, prefer-lowest	32s
PHP 8.1, windows-latest, prefer-stable	36s
PHP 8.2, ubuntu-latest, prefer-lowest	18s
PHP 8.2, ubuntu-latest, prefer-stable	10s
PHP 8.2, macos-latest, prefer-lowest	1m 10s
PHP 8.2, macos-latest, prefer-stable	1m 11s
PHP 8.2, windows-latest, prefer-lowest	40s
PHP 8.2, windows-latest, prefer-stable	37s
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 10s
PHP 8.3, windows-latest, prefer-lowest	44s
PHP 8.3, windows-latest, prefer-stable	46s
PHP 8.4, ubuntu-latest, prefer-lowest	13s
PHP 8.4, ubuntu-latest, prefer-stable	11s
PHP 8.4, macos-latest, prefer-lowest	1m 27s
PHP 8.4, macos-latest, prefer-stable	1m 22s
PHP 8.4, windows-latest, prefer-lowest	32s
PHP 8.4, windows-latest, prefer-stable	39s
	17m 13s

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