Bump fakeredis from 2.20.1 to 2.21.1 (#326)

Bumps [fakeredis](https://github.com/cunla/fakeredis-py) from 2.20.1 to 2.21.1.
- [Release notes](https://github.com/cunla/fakeredis-py/releases)
- [Commits](cunla/fakeredis-py@v2.20.1...v2.21.1)

---
updated-dependencies:
- dependency-name: fakeredis
  dependency-type: direct:production
  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>

requirements.txt

@@ -8,7 +8,7 @@ pymongo==4.6.1
 tornado==6.4
 captcha==0.5.0
 passlib==1.7.4
-fakeredis==2.20.1
+fakeredis==2.21.1
 filetype==1.2.0
 requests[socks]
 tqdm==4.66.1