Bump fakeredis from 2.30.2 to 2.31.3 in /requirements

Bumps [fakeredis](https://github.com/cunla/fakeredis-py) from 2.30.2 to 2.31.3.
- [Release notes](https://github.com/cunla/fakeredis-py/releases)
- [Commits](cunla/fakeredis-py@v2.30.2...v2.31.3)

---
updated-dependencies:
- dependency-name: fakeredis
  dependency-version: 2.31.3
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements/dev.txt

@@ -8,4 +8,4 @@ django-debug-toolbar==6.0.0
 pylint<3
 black==25.1.0
 pre-commit==4.2.0
-fakeredis==2.30.2
+fakeredis==2.31.3