fix(staging/infra/redis): use correct connection factory

[gagantrivedi]

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Changes

fix DJANGO_REDIS_CONNECTION_FACTORY environment variable

How did you test this code?

Tested by deploying this to staging temporarily

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Name	Status	Preview	Comments	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 31, 2024 8:07am
flagsmith-frontend-preview	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 31, 2024 8:07am
flagsmith-frontend-staging	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 31, 2024 8:07am

[github-actions]

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (61537ce) 95.96% compared to head (c41d8a5) 18.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #3353       +/-   ##
===========================================
- Coverage   95.96%   18.00%   -77.96%     
===========================================
  Files        1071      990       -81     
  Lines       32743    28560     -4183     
===========================================
- Hits        31421     5143    -26278     
- Misses       1322    23417    +22095     

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