chore(deps): bump jiffy to ^6.4.5

[xsahil03x]

Summary

• Bumps jiffy from ^6.4.4 to ^6.4.5 in melos.yaml and packages/stream_chat_flutter/pubspec.yaml.
• Picks up the cached locale and DateFormat lookup work in jama5262/jiffy#332, making relative-time formatting cheaper.

Targets v10.0.0 because jiffy 6.4.x requires intl ^0.20.2, which only resolves against the Flutter SDK floor on this branch (>=3.38.1); master is still pinned at >=3.27.4 (intl 0.19.0).

Test plan

• melos bootstrap
• melos run lint:all
• melos run test:all

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• Commit unit tests in branch chore/bump-jiffy-6.4.5-v10

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.55%. Comparing base (583f7b6) to head (489ec0e).

Additional details and impacted files

@@           Coverage Diff            @@
##           v10.0.0    #2719   +/-   ##
========================================
  Coverage    67.55%   67.55%           
========================================
  Files          408      408           
  Lines        24521    24521           
========================================
  Hits         16565    16565           
  Misses        7956     7956           

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