Bump redis from 4.5.5 to 4.6.0 (zarr-developers#1446)

Bumps [redis](https://github.com/redis/redis-py) from 4.5.5 to 4.6.0.
- [Release notes](https://github.com/redis/redis-py/releases)
- [Changelog](https://github.com/redis/redis-py/blob/master/CHANGES)
- [Commits](redis/redis-py@v4.5.5...v4.6.0)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Joe Hamman <joe@earthmover.io>

Author: dependabot[bot]

requirements_dev_optional.txt

@@ -8,7 +8,7 @@ ipywidgets==8.0.7
 # don't let pyup change pinning for azure-storage-blob, need to pin to older
 # version to get compatibility with azure storage emulator on appveyor (FIXME)
 azure-storage-blob==12.16.0 # pyup: ignore
-redis==4.5.5
+redis==4.6.0
 types-redis
 types-setuptools
 pymongo==4.4.0