chore(deps): update dependency flutter_lints to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
flutter_lints (source)	dev_dependencies	major	^4.0.0 -> ^6.0.0

---

Warning

Some dependencies could not be looked up. Check the warning logs for more information.

---

Release Notes

flutter/packages (flutter_lints)

v6.0.0

Compare Source

• Updates package:lints dependency to version 6.0.0, with the following changes:
  • adds strict_top_level_inference
  • adds unnecessary_underscores
• Updates minimum supported SDK version to Flutter 3.32/Dart 3.8.

v5.0.0

Compare Source

• Updates package:lints dependency to version 5.0.0, with the following changes:
  • adds invalid_runtime_check_with_js_interop_types
  • adds unnecessary_library_name
  • removes avoid_null_checks_in_equality_operators
• Removes the following lints (see dart-lang/lints#205):
  • prefer_const_constructors
  • prefer_const_declarations
  • prefer_const_literals_to_create_immutables
• Updates minimum supported SDK version to Flutter 3.24/Dart 3.5.

---

Configuration

📅 Schedule: Branch creation - "after 9pm,before 6am" in timezone Europe/Zurich, Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.