chore(deps): bump meta from 1.15.0 to 1.18.2

[dependabot]

Bumps meta from 1.15.0 to 1.18.2.

Changelog

Sourced from meta's changelog.

3.13.0

Released on: Unreleased

Language

Dart 3.13 adds [primary constructors][primary-constructor-spec] to the language. To use this feature, set your package's [SDK constraint][language version] lower bound to 3.13 or greater (sdk: '^3.13.0').

Primary constructors

The primary constructors feature is a brevity feature. There are no new semantics, but it lets you express declarations in a less verbose way.

This feature lets you specify one constructor and a set of instance variables in the header of a declaration.

Currently, you write a declaration with a constructor and some fields as:

// Current syntax.
class Point {
  int x;
  int y;
  Point(this.x, this.y);
}

Now you can write:

class Point(var int x, var int y);

If a primary constructor needs an initializer list, a body, or both, you can specify them inside the class using the this body syntax:

class Point(var int x, var int y) {
  this : assert(x >= 0) {
    print('Point created at $x, $y');
  }
}

As part of this feature, you can also use the new and factory keywords to declare constructors in the class body without repeating the class name:

</tr></table> 

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