Composer.json: use same constrains than EPV to align with titania constrains

Author: Skouat

composer.json

@@ -20,22 +20,19 @@
 	],
 	"minimum-stability": "stable",
 	"require": {
-		"php": "~7.4",
-		"symfony/yaml": "~3.4",
-		"symfony/console": "~3.4",
-		"symfony/finder": "~3.4",
+		"php": ">=7.2",
+		"symfony/yaml": "^3.0 || ^4.0 || ^5.0 || ^6.0",
+		"symfony/console": "^3.0 || ^4.0 || ^5.0 || ^6.0",
+		"symfony/finder": "^3.0 || ^4.0 || ^5.0 || ^6.0",
 		"battye/php-array-parser": "~1.0"
 	},
 	"require-dev": {
-		"phpunit/phpunit": "~9.0"
+                "phpunit/phpunit": "^6.5 || ^7.0 || ^8.0 || ^9.0"
 	},
 	"bin": [
 		"translation.php"
 	],
 	"config": {
-		"platform": {
-			"php": "7.4.33"
-		},
 		"bin-dir": "bin"
 	},
 	"autoload": {