Bump deps to ^4.4|^5.0 for Symfony 5.0

Author: nicolas-grekas

composer.json

@@ -22,23 +22,19 @@
     "require-dev": {
         "doctrine/dbal": "^2.5",
         "psr/cache": "~1.0",
-        "symfony/console": "^3.4|^4.0|^5.0",
-        "symfony/debug": "^4.1|^5.0",
-        "symfony/dependency-injection": "^3.4.19|^4.1.8|^5.0",
-        "symfony/doctrine-bridge": "^3.4|^4.0|^5.0",
-        "symfony/event-dispatcher": "^4.3|^5.0",
-        "symfony/http-kernel": "^3.4|^4.0|^5.0",
-        "symfony/process": "^3.4|^4.0|^5.0",
-        "symfony/property-access": "^3.4|^4.0|^5.0",
-        "symfony/serializer": "^3.4|^4.0|^5.0",
+        "symfony/console": "^4.4|^5.0",
+        "symfony/debug": "^4.4|^5.0",
+        "symfony/dependency-injection": "^4.4|^5.0",
+        "symfony/doctrine-bridge": "^4.4|^5.0",
+        "symfony/event-dispatcher": "^4.4|^5.0",
+        "symfony/http-kernel": "^4.4|^5.0",
+        "symfony/process": "^4.4|^5.0",
+        "symfony/property-access": "^4.4|^5.0",
+        "symfony/serializer": "^4.4|^5.0",
         "symfony/service-contracts": "^1.1",
-        "symfony/stopwatch": "^3.4|^4.0|^5.0",
-        "symfony/validator": "^3.4|^4.0|^5.0",
-        "symfony/var-dumper": "^3.4|^4.0|^5.0"
-    },
-    "conflict": {
-        "symfony/event-dispatcher": "<4.3",
-        "symfony/debug": "<4.1"
+        "symfony/stopwatch": "^4.4|^5.0",
+        "symfony/validator": "^4.4|^5.0",
+        "symfony/var-dumper": "^4.4|^5.0"
     },
     "suggest": {
         "enqueue/messenger-adapter": "For using the php-enqueue library as a transport."