Update dependency serve-static to ~1.15.0

Author: renovate[bot]

package-lock.json

@@ -29,7 +29,7 @@
     "finalhandler": "~1.1.1",
     "minimist": "~1.2.0",
     "open": "^8.0.0",
-    "serve-static": "~1.14.0",
+    "serve-static": "~1.15.0",
     "supervisor": "~0.12.0",
     "ws": "~8.11.0"
   },