update tc core lib version to 2.6.6

Author: ThomasKranitsas

package-lock.json

@@ -50,7 +50,7 @@
     "superagent": "^4.1.0",
     "swagger-ui-express": "^4.1.3",
     "tc-bus-api-wrapper": "topcoder-platform/tc-bus-api-wrapper.git",
-    "tc-core-library-js": "appirio-tech/tc-core-library-js.git#v2.6.4",
+    "tc-core-library-js": "appirio-tech/tc-core-library-js.git#v2.6.6",
     "uuid": "^8.3.0",
     "winston": "^3.2.1",
     "xss": "^1.0.7",