sdk: Bump amber engine

as now it uses amber/core

sdk/package.json

@@ -11,7 +11,7 @@
     "url": "https://lolg.it/amber/amber.git"
   },
   "engines": {
-    "amber": ">=0.22.4",
+    "@ambers/lang": ">0.22.6",
     "node": ">=4.0.0"
   },
   "author": "",