package:dart_style v3.1.6

Style changes

• When trailing commas are preserved, don't insert a newline before the ; in
  an enum with members unless there actually is a trailing comma.
  (Fix by @Barbirosha.)

Internal changes

• Support upcoming Dart language version 3.12.
• Stop using experiment flags for features released in 3.10.
• Require sdk: ^3.10.0.