chore(deps): update dependency start-server-and-test to v1.12.6

Author: renovate-bot

package-lock.json

@@ -74,7 +74,7 @@
     "prettier": "2.3.2",
     "semantic-release": "17.4.4",
     "serve": "11.3.2",
-    "start-server-and-test": "1.12.5",
+    "start-server-and-test": "1.12.6",
     "ts-loader": "8.3.0",
     "typescript": "4.3.5",
     "webpack": "4.46.0",