Bump winston from 3.13.0 to 3.15.0

Bumps [winston](https://github.com/winstonjs/winston) from 3.13.0 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@v3.13.0...v3.15.0)

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

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