Update dependency start-server-and-test to v1.11.6

Author: renovate-bot

package-lock.json

@@ -38,7 +38,7 @@
     "istanbul-lib-coverage": "2.0.5",
     "nyc": "14.1.1",
     "script-ext-html-webpack-plugin": "2.1.5",
-    "start-server-and-test": "1.11.5",
+    "start-server-and-test": "1.11.6",
     "webpack": "4.44.2",
     "webpack-cli": "3.3.12",
     "webpack-dev-server": "3.11.0"