Added django-storages[boto3] dependency for S3 support

[saikat709]

Added django-storages[boto3]==1.14.6 to production dependencies.

This dependency is needed for PR #2844 (Added optional django-storages (S3) support for media) which refers to issue #2802.

AI Assistance Disclosure (REQUIRED)

• No AI tools were used in preparing this PR.
• If AI tools were used, I have disclosed which ones and fully reviewed and verified their output.

[tobiasmcnulty]

Looks good, thanks!

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Additional details and impacted files

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  Hits            ?     6611           
  Misses          ?      815           
  Partials        ?       87           

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[ulgens]

@django/django-website-mergers Can we have a rebase merge to keep it clean?