Bump prom-client from 11.2.0 to 11.2.1 (#2583)

Bumps [prom-client](https://github.com/siimon/prom-client) from 11.2.0 to 11.2.1.
- [Release notes](https://github.com/siimon/prom-client/releases)
- [Changelog](https://github.com/siimon/prom-client/blob/master/CHANGELOG.md)
- [Commits](siimon/prom-client@v11.2.0...v11.2.1)

Signed-off-by: dependabot[bot] <support@dependabot.com>

package.json

@@ -46,7 +46,7 @@
     "path-to-regexp": "^2.4.0",
     "pretty-bytes": "^5.0.0",
     "priorityqueuejs": "^1.0.0",
-    "prom-client": "^11.2.0",
+    "prom-client": "^11.2.1",
     "query-string": "^6.0.0",
     "raven": "^2.4.2",
     "redis": "~2.8.0",