Bump fakeredis from 2.20.1 to 2.21.3

Bumps [fakeredis](https://github.com/cunla/fakeredis-py) from 2.20.1 to 2.21.3.
- [Release notes](https://github.com/cunla/fakeredis-py/releases)
- [Commits](cunla/fakeredis-py@v2.20.1...v2.21.3)

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

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