Update dependency flutter_lints to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
flutter_lints (source)	dev_dependencies	major	^5.0.0 -> 6.0.0

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Release Notes

flutter/packages (flutter_lints)

v6.0.0

Compare Source

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[sourcery-ai]

Reviewer's Guide

This PR upgrades the flutter_lints dev dependency from ^5.0.0 to ^6.0.0, regenerates the lockfile, and pulls in new lint rules (strict_top_level_inference, unnecessary_underscores) along with updated SDK support.

File-Level Changes

Change	Details	Files
Bump flutter_lints to 6.0.0	Updated flutter_lints version in pubspec.yaml from ^5.0.0 to ^6.0.0 Regenerated pubspec.lock to lock flutter_lints@6.0.0	pubspec.yaml pubspec.lock

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Quality Gate passed

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[sonarqubecloud]

Quality Gate passed

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See analysis details on SonarQube Cloud