Bump collection from 1.17.2 to 1.18.0 in /app_dart (#2957)

Bumps [collection](https://github.com/dart-lang/collection) from 1.17.2 to 1.18.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/dart-lang/collection/releases">collection's releases</a>.</em></p>
<blockquote>
<h2>package:collection v1.18.0</h2>
<ul>
<li><code>CanonicalizedMap</code>:
<ul>
<li>Added <code>copy</code>: copies an instance without recalculating the canonical values of the keys.</li>
<li>Added <code>toMap</code>: creates a <code>Map&lt;K,V&gt;</code> (with the original key values).</li>
<li>Added <code>toMapOfCanonicalKeys</code>: creates a <code>Map&lt;C,V&gt;</code> (with the canonicalized keys).</li>
</ul>
</li>
<li>Fixes bugs in <code>ListSlice.slice</code> and <code>ListExtensions.slice</code>.</li>
<li>Update to <code>package:lints</code> 2.0.1.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/dart-lang/collection/blob/master/CHANGELOG.md">collection's changelog</a>.</em></p>
<blockquote>
<h2>1.18.0</h2>
<ul>
<li><code>CanonicalizedMap</code>:
<ul>
<li>Added methods:
<ul>
<li><code>copy</code>: copies an instance without recalculating the canonical values of the keys.</li>
<li><code>toMap</code>: creates a <code>Map&lt;K,V&gt;</code> (with the original key values).</li>
<li><code>toMapOfCanonicalKeys</code>: creates a <code>Map&lt;C,V&gt;</code> (with the canonicalized keys).</li>
</ul>
</li>
</ul>
</li>
<li>Fixes bugs in <code>ListSlice.slice</code> and <code>ListExtensions.slice</code>.</li>
<li>Update to <code>package:lints</code> 2.0.1.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/dart-lang/collection/commit/0a2885a90717cc9322faaa6a7365b69e06b531dc"><code>0a2885a</code></a> prep for publishing 1.18.0 (<a href="https://redirect.github.com/dart-lang/collection/issues/299">#299</a>)</li>
<li><a href="https://github.com/dart-lang/collection/commit/db343da9fa9653882951c64a05df2eba63a02e21"><code>db343da</code></a> Bump actions/checkout from 3.5.2 to 3.5.3 (<a href="https://redirect.github.com/dart-lang/collection/issues/295">#295</a>)</li>
<li><a href="https://github.com/dart-lang/collection/commit/a37bd51c63b7720799869e3448eafbc19c88bfa6"><code>a37bd51</code></a> Fix bugs in <code>ListExtensions.slice</code> and <code>ListSlice.slice</code>. (<a href="https://redirect.github.com/dart-lang/collection/issues/290">#290</a>)</li>
<li><a href="https://github.com/dart-lang/collection/commit/f949b09b130ddc1cb59fd056e071cecb458e8fb6"><code>f949b09</code></a> <code>CanonicalizedMap</code>: new <code>copy</code>, <code>toMap</code> and <code>toMapOfCanonicalKeys</code> methods (#...</li>
<li><a href="https://github.com/dart-lang/collection/commit/db2da4891f848b598fe604f1e64aa3eb2efe2b6d"><code>db2da48</code></a> blast_repo fixes (<a href="https://redirect.github.com/dart-lang/collection/issues/288">#288</a>)</li>
<li>See full diff in <a href="https://github.com/dart-lang/collection/compare/v1.17.2...v1.18.0">compare view</a></li>
</ul>
</details>
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app_dart/pubspec.yaml

@@ -13,7 +13,7 @@ environment:
 dependencies:
   appengine: 0.13.6
   args: 2.4.2
-  collection: 1.17.2
+  collection: 1.18.0
   corsac_jwt: 1.0.0-nullsafety.1
   crypto: 3.0.3
   dbcrypt: 2.0.0