chore(deps): update dependency start-server-and-test to v1.15.4

Author: renovate[bot]

package.json

@@ -82,7 +82,7 @@
     "rollup-plugin-terser": "7.0.2",
     "search-insights": "^2.15.0",
     "shipjs": "0.26.1",
-    "start-server-and-test": "1.15.2",
+    "start-server-and-test": "1.15.4",
     "stylelint": "13.13.1",
     "stylelint-a11y": "1.2.3",
     "stylelint-config-prettier": "8.0.2",