feat(sdk-core): update the ibm-cloud-sdk-core to 5.4.0

Author: lisperata

package-lock.json

@@ -80,7 +80,7 @@
     "async": "^3.2.0",
     "camelcase": "^6.2.0",
     "extend": "~3.0.2",
-    "ibm-cloud-sdk-core": "^5.1.0",
+    "ibm-cloud-sdk-core": "^5.4.0",
     "isstream": "~0.1.2",
     "websocket": "^1.0.33"
   },