Correct return value for init command

[AJenbo]

Questions	Answers
Description?	This correct a type error when running the phpstan init command
Type?	bug fix
BC breaks?	no
Deprecations?	no
How to test?	Please indicate how to best verify that this PR is correct.

PHP Fatal error:  Uncaught TypeError: Return value of "PrestaShop\CodingStandards\Command\PhpStanInitCommand::execute()" must be of the type int, "null" returned. in vendor/symfony/console/Command/Command.php:258
Stack trace:
#0 vendor/symfony/console/Application.php(971): Symfony\Component\Console\Command\Command->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#1 vendor/symfony/console/Application.php(290): Symfony\Component\Console\Application->doRunCommand(Object(PrestaShop\CodingStandards\Command\PhpStanInitCommand), Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#2 vendor/symfony/console/Application.php(166): Symfony\Component\Console\Application->doRun(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component in vendor/symfony/console/Command/Command.php on line 258

[PierreRambaud]

I think you have a problem with your phpstan container, because this const is not available before Symfony 5, it failed on Symfony 3 & 4. The composer.lock is targeting the v3.4.42

[AJenbo]

composer.lock does not propagate, it's basically meaningless to have it for a library

https://getcomposer.org/doc/02-libraries.md#lock-file

[AJenbo]

I have updated it to use an int so that it should be compatible with Symfony 3-5

[PierreRambaud]

I don't see any reason to keep the composer.lock file in this repository 🤔

[PierreRambaud]

Thank @AJenbo