Bump fakeredis from 1.4.1 to 1.4.2 in /cvat/requirements (#1987)

Bumps [fakeredis](https://github.com/jamesls/fakeredis) from 1.4.1 to 1.4.2.
- [Release notes](https://github.com/jamesls/fakeredis/releases)
- [Commits](https://github.com/jamesls/fakeredis/compare/1.4.1...1.4.2)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

cvat/requirements/testing.txt

@@ -1,5 +1,5 @@
 -r development.txt
-fakeredis==1.4.1
+fakeredis==1.4.2
 # Fix dependencies for fakeredis 1.1.0
 # Pip will not reinstall six package if it is installed already
 six==1.15.0