more strict requirements of experimental components

Author: xabbuh

composer.json

@@ -51,7 +51,7 @@
         "symfony/security-http": "^4.4|^5.0",
         "symfony/serializer": "^4.4|^5.0",
         "symfony/stopwatch": "^4.4|^5.0",
-        "symfony/string": "^5.0",
+        "symfony/string": "~5.0.0",
         "symfony/translation": "^5.0",
         "symfony/twig-bundle": "^4.4|^5.0",
         "symfony/validator": "^4.4|^5.0",
@@ -79,8 +79,10 @@
         "symfony/mailer": "<4.4",
         "symfony/messenger": "<4.4",
         "symfony/mime": "<4.4",
+        "symfony/notifier": ">=5.1",
         "symfony/property-info": "<4.4",
         "symfony/serializer": "<4.4",
+        "symfony/string": ">=5.1",
         "symfony/stopwatch": "<4.4",
         "symfony/translation": "<5.0",
         "symfony/twig-bridge": "<4.4",