[composer] Set dependencies for 1.2.2 release.

Author: Łukasz Serwatka

composer.json

@@ -17,7 +17,7 @@
   },
   "require": {
     "php": "^7.3",
-    "ezsystems/ezplatform-kernel": "^1.3@dev",
+    "ezsystems/ezplatform-kernel": "^1.3",
     "symfony/dependency-injection": "^5.0",
     "symfony/http-kernel": "^5.0",
     "symfony/http-foundation": "^5.0",