Update dependency highlight.js to v9.15.10

Author: renovate-bot

web/package-lock.json

@@ -9,7 +9,7 @@
   },
   "dependencies": {
     "doctrine": "2.1.0",
-    "highlight.js": "9.13.1",
+    "highlight.js": "9.15.10",
     "htmlescape": "1.1.1",
     "ramda": "0.26.0",
     "react": "16.6.0",