fix(deps): update dependency prom-client to v14 (#2342)

Author: renovate-bot

monitoring/prometheus/package.json

@@ -13,7 +13,7 @@
     "express": "^4.17.1",
     "lint": "^0.7.0",
     "node-stopwatch": "^0.0.1",
-    "prom-client": "^13.0.0",
+    "prom-client": "^14.0.0",
     "sleep": "^6.3.0",
     "supertest": "^6.1.3"
   },