Merge pull request #3930 from django-oscar/dependabot/pip/redis-gte-3.5-and-lt-4.4

Update redis requirement from <4.2,>=3.5 to >=3.5,<4.4

requirements.txt

 django-environ>=0.4,<0.9
 django-redis>=4.12,<5.3
 pysolr>=3.9,<3.10
-redis>=3.5,<4.2
+redis>=3.5,<4.4
 requests>=2.25,<3
 uWSGI>=2.0.19,<2.1
 whitenoise>=5.2,<6.1