chore(deps): update dependency dart_style to ^3.1.2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
dart_style	dev_dependencies	patch	^3.1.0 -> ^3.1.2

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Release Notes

dart-lang/dart_style (dart_style)

v3.1.2

Compare Source

• Support dot shorthand syntax.
• Update to the latest package:analyzer.
• Enable language version 3.10.

Bug fixes

• Preserved trailing commas (trailing_commas: preserve) applies to record
  type annotations too (#​1721).

Style changes

This change only applies to code whose language version is 3.10 or higher:

• When trailing_commas is preserve, preserve a trailing comma after the last
  enum constant when members are present (#​1678, #​1729).

  // Before formatting:
  enum { constant, ; member() {} }
  
  // After formatting at language version 3.9 or lower:
  enum {
    constant;
  
    member() {}
  }
  
  // After formatting at language version 3.10 or higher:
  enum {
    constant,
    ;
  
    member() {}
  }

  (Thanks to jellynoone@ for this change.)

v3.1.1

Compare Source

• Update to latest analyzer and enable language version 3.9.

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