fix: upgrade nodemon from 2.0.14 to 2.0.15

Snyk has created this PR to upgrade nodemon from 2.0.14 to 2.0.15.

See this package in npm:
https://www.npmjs.com/package/nodemon

See this project in Snyk:
https://app.snyk.io/org/loft-fzm/project/66c0b803-cf4f-433b-9736-4ca0734ac7ce?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

examples/buildkit-in-cluster/package-lock.json

@@ -8,7 +8,7 @@
   },
   "dependencies": {
     "express": "^4.13.3",
-    "nodemon": "^2.0.14"
+    "nodemon": "^2.0.15"
   },
   "keywords": [
     "node",