Bump @bull-board/express from 5.13.0 to 5.15.1

Bumps [@bull-board/express](https://github.com/felixmosh/bull-board/tree/HEAD/packages/express) from 5.13.0 to 5.15.1.
- [Release notes](https://github.com/felixmosh/bull-board/releases)
- [Changelog](https://github.com/felixmosh/bull-board/blob/master/CHANGELOG.md)
- [Commits](https://github.com/felixmosh/bull-board/commits/v5.15.1/packages/express)

---
updated-dependencies:
- dependency-name: "@bull-board/express"
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

package.json

@@ -76,7 +76,7 @@
   "dependencies": {
     "@aws-crypto/client-node": "4.0.0",
     "@bull-board/api": "^5.13.0",
-    "@bull-board/express": "^5.13.0",
+    "@bull-board/express": "^5.15.1",
     "@bull-board/nestjs": "^5.11.0",
     "@docusaurus/core": "3.1.1",
     "@docusaurus/preset-classic": "3.1.0",