feat: allow new versions of symfony/*

Closes: #45

composer.json

@@ -38,11 +38,11 @@
         "php": "^7.2.20 || ^8.0",
         "twig/twig": "^3.0",
         "nikic/php-parser": "^4.10",
-        "symfony/console": "~3.4|~4.3|~5.1|~5.2",
-        "symfony/finder": "~3.4|~4.3|~5.1|~5.2",
-        "symfony/filesystem": "~3.4|~4.3|~5.1|~5.2",
-        "symfony/yaml": "~3.4|~4.3|~5.1|~5.2",
-        "symfony/process": "~3.4|~4.3|~5.1|~5.2",
+        "symfony/console": "~3.4|~4.3|~5.1|~5.2|~5.3|~5.4|~6.0",
+        "symfony/finder": "~3.4|~4.3|~5.1|~5.2|~5.3|~5.4|~6.0",
+        "symfony/filesystem": "~3.4|~4.3|~5.1|~5.2|~5.3|~5.4|~6.0",
+        "symfony/yaml": "~3.4|~4.3|~5.1|~5.2|~5.3|~5.4|~6.0",
+        "symfony/process": "~3.4|~4.3|~5.1|~5.2|~5.3|~5.4|~6.0",
         "phpdocumentor/reflection-docblock": "~5.3",
         "wdes/php-i18n-l10n": "^4.0",
         "code-lts/cli-tools": "^1.4.0",