refactor: bump winston from 3.13.1 to 3.15.0

Bumps [winston](https://github.com/winstonjs/winston) from 3.13.1 to 3.15.0.
- [Release notes](https://github.com/winstonjs/winston/releases)
- [Changelog](https://github.com/winstonjs/winston/blob/master/CHANGELOG.md)
- [Commits](winstonjs/winston@v3.13.1...v3.15.0)

---
updated-dependencies:
- dependency-name: winston
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -61,7 +61,7 @@
     "subscriptions-transport-ws": "0.11.0",
     "tv4": "1.3.0",
     "uuid": "10.0.0",
-    "winston": "3.13.1",
+    "winston": "3.15.0",
     "winston-daily-rotate-file": "5.0.0",
     "ws": "8.18.0"
   },