Upgrade to the latest Symfony version

Author: battye

composer.json

@@ -20,14 +20,14 @@
 	],
 	"minimum-stability": "stable",
 	"require": {
-		"php": ">=5.5.9",
-		"symfony/yaml": "~3.0",
-		"symfony/console": "~3.0",
-		"symfony/finder": "~3.0",
+		"php": ">=8.1",
+		"symfony/yaml": "~6.3",
+		"symfony/console": "~6.3",
+		"symfony/finder": "~6.3",
 		"battye/php-array-parser": "~1.0"
 	},
 	"require-dev": {
-		"phpunit/phpunit": "~5.7"
+		"phpunit/phpunit": "~8.0"
 	},
 	"bin": [
 		"translation.php"