chore(deps-dev): bump @types/superagent from 4.1.10 to 4.1.15

Bumps [@types/superagent](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/superagent) from 4.1.10 to 4.1.15.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/superagent)

---
updated-dependencies:
- dependency-name: "@types/superagent"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]