docs: add keyv-s3fifo to third-party storage adapters

[BJS-kr]

Adds keyv-s3fifo to the Third-Party Storage Adapters documentation table.

• npm: https://www.npmjs.com/package/keyv-s3fifo
• Repository: https://github.com/BJS-kr/fast-s3-fifo-cache

[gemini-code-assist]

Code Review

This pull request updates the documentation in third-party-storage-adapters.md to include the keyv-s3fifo storage adapter in the list of third-party adapters. There are no review comments, and I have no feedback to provide.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (e07dc4c) to head (6550d05).

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #2020   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           55        55           
  Lines         5067      5067           
  Branches       826       827    +1     
=========================================
  Hits          5067      5067           

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