Bump types-redis from 4.1.13 to 4.1.15

Bumps [types-redis](https://github.com/python/typeshed) from 4.1.13 to 4.1.15.
- [Release notes](https://github.com/python/typeshed/releases)
- [Commits](https://github.com/python/typeshed/commits)

---
updated-dependencies:
- dependency-name: types-redis
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]