feat: Bump flutter_lints from 4.0.0 to 6.0.0 in /packages/flutter

[Copilot]

Pull Request

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Issue

Closes: #1061

Approach

Bumps flutter_lints from 4.0.0 to 6.0.0. The new version introduces stricter linting rules that require explicit type annotations.

Fixes:

• parse_notification.dart: Add String type to title parameter
• parse_push.dart: Add explicit dynamic type to firebaseMessaging and message parameters (intentionally dynamic to avoid hard dependency on firebase_messaging)
• parse_push.dart: Fix doc comment <List<String>> → `List<String>` to avoid HTML parsing issues

Tasks

• Add changes to documentation (guides, repository pages, code comments)

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (dependabot/pub/packages/flutter/flutter_lints-6.0.0@00d602d). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...utter/lib/src/notification/parse_notification.dart	0.00%	1 Missing ⚠️
packages/flutter/lib/src/push/parse_push.dart	0.00%	1 Missing ⚠️

Additional details and impacted files

@@                                  Coverage Diff                                   @@
##             dependabot/pub/packages/flutter/flutter_lints-6.0.0    #1084   +/-   ##
======================================================================================
  Coverage                                                       ?   43.46%           
======================================================================================
  Files                                                          ?       61           
  Lines                                                          ?     3587           
  Branches                                                       ?        0           
======================================================================================
  Hits                                                           ?     1559           
  Misses                                                         ?     2028           
  Partials                                                       ?        0           

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