[Bug] Wrong dependency

SyliusPayPalPlugin version affected: 1.4.x

Description

I may be wrong but I think using a dependency to mock the container in the standard require section of the composer.json file sounds wrong:

PayPalPlugin/composer.json

Lines 7 to 14 in b32c831

    
           "require": { 
        
               "php": "^7.4 || ^8.0", 
        
               "polishsymfonycommunity/symfony-mocker-container": "^1.0", 
        
               "sylius/sylius": "^1.10", 
        
               "phpseclib/phpseclib": "^2.0", 
        
               "sylius-labs/doctrine-migrations-extra-bundle": "^0.1.3", 
        
               "doctrine/doctrine-migrations-bundle": "^3.0" 
        
           },

I guess it's not super-super safe to have it in production as well? (didn't check anything, but since it's testing stuff...)

Possible Solution

Moving it to require-dev section.

	"require": {
	"php": "^7.4 \|\| ^8.0",
	"polishsymfonycommunity/symfony-mocker-container": "^1.0",
	"sylius/sylius": "^1.10",
	"phpseclib/phpseclib": "^2.0",
	"sylius-labs/doctrine-migrations-extra-bundle": "^0.1.3",
	"doctrine/doctrine-migrations-bundle": "^3.0"
	},