revert allowing Twig 4

As Twig 4 will not be released before Symfony 7.2 we should not claim
compatibility before a stable Twig 4 release.

Author: xabbuh

composer.json

@@ -50,7 +50,7 @@
         "symfony/twig-bridge": "^6.4|^7.0",
         "symfony/validator": "^6.4|^7.0",
         "symfony/yaml": "^6.4|^7.0",
-        "twig/twig": "^3.12|^4.0",
+        "twig/twig": "^3.12",
         "web-token/jwt-library": "^3.3.2|^4.0"
     },
     "conflict": {