Update dependency flutter_lints to v2 - abandoned

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
flutter_lints	dev_dependencies	major	^1.0.0 -> ^2.0.0

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Release Notes

flutter/packages

v2.0.1

Compare Source

• Updated readme to document suggestion process for new lints

v2.0.0

Compare Source

• Added the following lints:
  • sort_child_properties_last
  • use_build_context_synchronously
• Updated package:lints dependency to version 2.0.0, which added the following lints:
  • depend_on_referenced_packages
  • library_private_types_in_public_api
  • no_leading_underscores_for_library_prefixes
  • no_leading_underscores_for_local_identifiers
  • null_check_on_nullable_type_parameter
  • prefer_interpolation_to_compose_strings
  • unnecessary_constructor_name
  • unnecessary_late
  • unnecessary_null_aware_assignments
  • unnecessary_nullable_for_final_variable_declarations
• Bumped the minimum required Dart SDK version to 2.17

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