build(deps): bump fakeredis from 1.4.3 to 1.4.4 in /backend (#640)

Bumps [fakeredis](https://github.com/jamesls/fakeredis) from 1.4.3 to 1.4.4.
- [Release notes](https://github.com/jamesls/fakeredis/releases)
- [Commits](jamesls/fakeredis@1.4.3...1.4.4)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

backend/requirements-dev.txt

@@ -1,4 +1,4 @@
-fakeredis==1.4.3
+fakeredis==1.4.4
 pre-commit==2.7.1
 pytest==6.1.1
 pytest-responses==0.4.0

backend/requirements.txt

@@ -1,7 +1,7 @@
 -e ../tools #egg=code-coverage-tools
 connexion==2.7.0
 datadog==0.39.0
-fakeredis==1.4.3
+fakeredis==1.4.4
 Flask==1.1.2
 Flask-Cors==3.0.9
 flask-talisman==0.7.0