Bump flutter_lints from 1.0.4 to 2.0.1

[dependabot[bot]]

Bumps flutter_lints from 1.0.4 to 2.0.1.

Commits

• 8e3ce4f Document how to suggest lints for flutter_lints (#1546)
• b7cd2f4 [pigeon] Minor fixes to NNBD type handling in Dart (#1543)
• cb22b39 [pigeon] Enable NNBD in tool (#1532)
• 48cdaf6 [flutter_markdown] update markdown dependency (#1395)
• 3f8a502 [pigeon] Remove support for non-NNBD (#1524)
• 4eda7ad [pigeon] Fixes bug where Dart FlutterApis would assert that a nullable argu...
• dff39d7 [go_router]refactor runtime check to assert (#1362)
• 5600590 [go_router] Export inherited_go_router.dart file (#1145)
• d8bf76e [flutter_markdown] Remove build status from README.md (#1326)
• bc223c1 Remove checked in binaries from flutter/packages. (#1338)
• Additional commits viewable in compare view

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