Composer: prevent a lock file from being created #318

Job	Run time
Test: PHP 5.5 on PHPCS 3.5.6	22s
Test: PHP 5.5 on PHPCS dev-master	23s
Test: PHP 5.6 on PHPCS 3.5.6	23s
Test: PHP 5.6 on PHPCS dev-master	21s
Test: PHP 7.0 on PHPCS 3.5.6	17s
Test: PHP 7.0 on PHPCS dev-master	19s
Test: PHP 7.1 on PHPCS 3.5.6	27s
Test: PHP 7.1 on PHPCS dev-master	36s
Test: PHP 7.2 on PHPCS 3.5.6	19s
Test: PHP 7.2 on PHPCS dev-master	23s
Test: PHP 7.3 on PHPCS 3.5.6	26s
Test: PHP 7.3 on PHPCS dev-master	20s
Test: PHP 8.3 on PHPCS 3.6.1	21s
Test: PHP 8.2 on PHPCS 3.6.1	14s
Test: PHP 8.1 on PHPCS dev-master	17s
Test: PHP 8.1 on PHPCS 3.6.1	27s
Test: PHP 8.0 on PHPCS dev-master	28s
Test: PHP 8.0 on PHPCS 3.5.7	26s
Test: PHP 7.4 on PHPCS dev-master	21s
Test: PHP 8.4 on PHPCS dev-master	14s
Coverage: PHP 8.3 on PHPCS dev-master	27s
Coverage: PHP 7.4 on PHPCS 3.5.6	25s
Coverage: PHP 5.4 on PHPCS dev-master	1m 9s
Coverage: PHP 5.4 on PHPCS 3.5.6	1m 3s
coveralls-finish	2s
	10m 30s

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