fix: update core to enable use with more front-end environments

This includes a version of the core package that stubs out modules that
are both unnecessary for and problematic in certain browser environments
like React.

See this commit for more info:
IBM/node-sdk-core@006991b

Author: dpopp07

package-lock.json

@@ -91,7 +91,7 @@
     "async": "^3.2.0",
     "camelcase": "^6.2.0",
     "extend": "~3.0.2",
-    "ibm-cloud-sdk-core": "^2.7.1",
+    "ibm-cloud-sdk-core": "^2.10.3",
     "isstream": "~0.1.2",
     "websocket": "^1.0.33"
   },