build(deps): Bump fakeredis from 1.2.1 to 1.3.0 in /backend

Bumps [fakeredis](https://github.com/jamesls/fakeredis) from 1.2.1 to 1.3.0.
- [Release notes](https://github.com/jamesls/fakeredis/releases)
- [Commits](jamesls/fakeredis@1.2.1...1.3.0)

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

Author: dependabot-preview[bot]

backend/requirements-dev.txt

@@ -1,4 +1,4 @@
-fakeredis==1.2.1
+fakeredis==1.3.0
 pre-commit==2.2.0
 pytest==5.4.1
 pytest-responses==0.4.0

backend/requirements.txt

@@ -1,7 +1,7 @@
 -e ../tools #egg=code-coverage-tools
 connexion==2.6.0
 datadog==0.35.0
-fakeredis==1.2.1
+fakeredis==1.3.0
 Flask==1.1.1
 Flask-Cors==3.0.8
 flask-talisman==0.7.0