feat(package.json): Update dependency sockjs-client to v1.6.1

Author: renovate[bot]

package.json

@@ -55,7 +55,7 @@
     "prompt": "1.0.0",
     "react-dev-utils": "6.1.1",
     "react-error-overlay": "4.0.1",
-    "sockjs-client": "1.4.0",
+    "sockjs-client": "1.6.1",
     "string-replace-loader": "2.3.0",
     "strip-ansi": "6.0.0",
     "style-loader": "1.3.0",