Bump args from 2.4.1 to 2.4.2 (#971)

Bumps [args](https://github.com/dart-lang/args) from 2.4.1 to 2.4.2.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/dart-lang/args/releases">args's
releases</a>.</em></p>
<blockquote>
<h2>package:args v2.4.2</h2>
<ul>
<li>Change the validation of <code>mandatory</code> options; they now
perform validation when
the value is retrieved (from the <code>ArgResults</code> object),
instead of when the
args are parsed.</li>
<li>Require Dart 2.19.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/dart-lang/args/blob/master/CHANGELOG.md">args's
changelog</a>.</em></p>
<blockquote>
<h2>2.4.2</h2>
<ul>
<li>Change the validation of <code>mandatory</code> options; they now
perform validation when
the value is retrieved (from the <code>ArgResults</code> object),
instead of when the
args are parsed.</li>
<li>Require Dart 2.19.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/dart-lang/args/commit/a9543c021f9409832b1668f9256f247585362389"><code>a9543c0</code></a>
switch to using package:dart_flutter_team_lints (<a
href="https://redirect.github.com/dart-lang/args/issues/247">#247</a>)</li>
<li><a
href="https://github.com/dart-lang/args/commit/36407ea4e57e96afc963174ca9249d0c006d128c"><code>36407ea</code></a>
adjust the validation of mandatory options (<a
href="https://redirect.github.com/dart-lang/args/issues/246">#246</a>)</li>
<li><a
href="https://github.com/dart-lang/args/commit/f0f6cd22d29f15f86b3d2caab053bae029d30c9a"><code>f0f6cd2</code></a>
blast_repo fixes (<a
href="https://redirect.github.com/dart-lang/args/issues/243">#243</a>)</li>
<li>See full diff in <a
href="https://github.com/dart-lang/args/compare/v2.4.1...v2.4.2">compare
view</a></li>
</ul>
</details>
<br />


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pubspec.lock

@@ -45,10 +45,10 @@ packages:
  dependency: "direct dev"
  description:
  name: args
- sha256: c372bb384f273f0c2a8aaaa226dad84dc27c8519a691b888725dec59518ad53a
+ sha256: eef6c46b622e0494a36c5a12d10d77fb4e855501a91c1b9ef9339326e58f0596
  url: "https://pub.dev"
  source: hosted
- version: "2.4.1"
+ version: "2.4.2"
  async:
  dependency: transitive
  description: