Add workflow concurrency #187

Job	Run time
PHP 7.4, ubuntu-latest, prefer-lowest	28s
PHP 7.4, ubuntu-latest, prefer-stable	11s
PHP 7.4, macos-latest, prefer-lowest	1s
PHP 7.4, macos-latest, prefer-stable	1s
PHP 7.4, windows-latest, prefer-lowest	42s
PHP 7.4, windows-latest, prefer-stable	37s
PHP 8.0, ubuntu-latest, prefer-lowest	16s
PHP 8.0, ubuntu-latest, prefer-stable	27s
PHP 8.0, macos-latest, prefer-lowest	1s
PHP 8.0, macos-latest, prefer-stable	1s
PHP 8.0, windows-latest, prefer-lowest	34s
PHP 8.0, windows-latest, prefer-stable	35s
PHP 8.1, ubuntu-latest, prefer-lowest	12s
PHP 8.1, ubuntu-latest, prefer-stable	12s
PHP 8.1, macos-latest, prefer-lowest	1s
PHP 8.1, macos-latest, prefer-stable	1s
PHP 8.1, windows-latest, prefer-lowest	42s
PHP 8.1, windows-latest, prefer-stable	38s
PHP 8.2, ubuntu-latest, prefer-lowest	18s
PHP 8.2, ubuntu-latest, prefer-stable	13s
PHP 8.2, macos-latest, prefer-lowest	1s
PHP 8.2, macos-latest, prefer-stable	1s
PHP 8.2, windows-latest, prefer-lowest	30s
PHP 8.2, windows-latest, prefer-stable	30s
PHP 8.3, ubuntu-latest, prefer-lowest	15s
PHP 8.3, ubuntu-latest, prefer-stable	12s
PHP 8.3, macos-latest, prefer-lowest	1s
PHP 8.3, macos-latest, prefer-stable	1s
PHP 8.3, windows-latest, prefer-lowest	36s
PHP 8.3, windows-latest, prefer-stable	38s
	8m 56s

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