feat: upgrade prom-client from 14.1.1 to 15.0.0 (#326)

Snyk has created this PR to upgrade prom-client from 14.1.1 to 15.0.0.

See this package in npm:
https://www.npmjs.com/package/prom-client

See this project in Snyk:
https://app.snyk.io/org/nodeshift-agg/project/53f94480-e7ae-41d2-985c-270fae345664?utm_source=github&utm_medium=referral&page=upgrade-pr

Co-authored-by: snyk-bot <snyk-bot@snyk.io>

package.json

@@ -42,7 +42,7 @@
     "js-yaml": "^4.1.0",
     "node-os-utils": "^1.3.7",
     "overload-protection": "^1.2.3",
-    "prom-client": "^14.1.1",
+    "prom-client": "^15.0.0",
     "qs": "^6.11.2"
   },
   "devDependencies": {