[composer] Set dependencies for 1.5.5 release

Author: Łukasz Serwatka

composer.json

@@ -16,13 +16,13 @@
         "php": ">=7.1",
         "symfony/symfony": "^3.4",
         "jms/translation-bundle": "^1.3.2",
-        "ezsystems/ezpublish-kernel": "^7.5.2@dev",
-        "ezsystems/repository-forms": "^2.5@dev",
-        "ezsystems/ezplatform-admin-ui-modules": "^1.5@dev",
-        "ezsystems/ez-support-tools": "^1.0@dev",
-        "ezsystems/ezplatform-design-engine": "^2.0@dev",
-        "ezsystems/ezplatform-user": "^1.0@dev",
-        "ezsystems/ezplatform-richtext": "^1.1.2@dev",
+        "ezsystems/ezpublish-kernel": "^7.5.2",
+        "ezsystems/repository-forms": "^2.5",
+        "ezsystems/ezplatform-admin-ui-modules": "^1.5",
+        "ezsystems/ez-support-tools": "^1.0",
+        "ezsystems/ezplatform-design-engine": "^2.0",
+        "ezsystems/ezplatform-user": "^1.0",
+        "ezsystems/ezplatform-richtext": "^1.1.2",
         "white-october/pagerfanta-bundle": "^1.1",
         "knplabs/knp-menu-bundle": "^2.1",
         "mck89/peast": "^1.8",