Bump json_serializable and freezed in /code_sharing/shared (#2556)

Bumps [json_serializable](https://github.com/google/json_serializable.dart) and [freezed](https://github.com/rrousselGit/freezed). These dependencies needed to be updated together.
Updates `json_serializable` from 6.9.0 to 6.9.2
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/google/json_serializable.dart/releases">json_serializable's releases</a>.</em></p>
<blockquote>
<h2>package:json_serializable v6.9.2</h2>
<ul>
<li>Support the latest <code>package:analyzer</code>.</li>
</ul>
<h2>package:json_serializable v6.9.1</h2>
<ul>
<li>Support the latest <code>package:analyzer</code> and <code>package:source_gen</code>.</li>
<li>Require Dart 3.6</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/google/json_serializable.dart/commit/d8311be1823007344bd17eb7f5f00b885ab2b033"><code>d8311be</code></a> Actually bump pkg:analyzer dep (<a href="https://redirect.github.com/google/json_serializable.dart/issues/1466">#1466</a>)</li>
<li><a href="https://github.com/google/json_serializable.dart/commit/52c25ccdbecbbf1cf1adfb512833dd371fd6eba2"><code>52c25cc</code></a> Support latest packages, bump min SDK to 3.6 (<a href="https://redirect.github.com/google/json_serializable.dart/issues/1465">#1465</a>)</li>
<li><a href="https://github.com/google/json_serializable.dart/commit/d3cee9920173ca9bde2e2d4b2a35d8552ce75f9f"><code>d3cee99</code></a> Bump the dependencies group with 2 updates (<a href="https://redirect.github.com/google/json_serializable.dart/issues/1461">#1461</a>)</li>
<li>See full diff in <a href="https://github.com/google/json_serializable.dart/compare/json_serializable-v6.9.0...json_serializable-v6.9.2">compare view</a></li>
</ul>
</details>
<br />

Updates `freezed` from 2.5.7 to 3.0.0-0.0.dev
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/rrousselGit/freezed/commit/c8361edfe2f76662037eee4c0ed02fb5e0da558a"><code>c8361ed</code></a> emoji</li>
<li><a href="https://github.com/rrousselGit/freezed/commit/467620719145bf2a701fb6993104ce03aa57c33d"><code>4676207</code></a> Limited union support</li>
<li><a href="https://github.com/rrousselGit/freezed/commit/64d073270f8132e1cdcc4fc88633f68bf5b31887"><code>64d0732</code></a> Mention pubspec</li>
<li><a href="https://github.com/rrousselGit/freezed/commit/6d404a3e315bc9bd43e2a63d425f0e9bd62f8fe1"><code>6d404a3</code></a> Initial release</li>
<li><a href="https://github.com/rrousselGit/freezed/commit/7d413a1fa97062143245c369d960aa3ade89b069"><code>7d413a1</code></a> Lints</li>
<li><a href="https://github.com/rrousselGit/freezed/commit/9f35603916e482b9e57c0b933a370677d2b5ea18"><code>9f35603</code></a> Port</li>
<li><a href="https://github.com/rrousselGit/freezed/commit/0d72188a23e76c37fb3e960ad70aab2d9f56ccdd"><code>0d72188</code></a> Delete more</li>
<li><a href="https://github.com/rrousselGit/freezed/commit/24bf8435dcd48da8e05911e02b2cf5ef67e8a6e7"><code>24bf843</code></a> Delete stuff</li>
<li><a href="https://github.com/rrousselGit/freezed/commit/5f0b80c0b52e4c08ea2dab7770d3e15cd51d42cd"><code>5f0b80c</code></a> chore: update sponsors.svg</li>
<li><a href="https://github.com/rrousselGit/freezed/commit/505b32f41567363704e4e66e45695d05dc09d6b4"><code>505b32f</code></a> chore: update sponsors.svg</li>
<li>Additional commits viewable in <a href="https://github.com/rrousselGit/freezed/compare/[email protected]">compare view</a></li>
</ul>
</details>
<br />

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</details>

code_sharing/shared/pubspec.yaml

@@ -11,7 +11,7 @@ dependencies:
 
 dev_dependencies:
   build_runner: ^2.2.1
-  freezed: ^2.1.1
+  freezed: ">=2.1.1 <4.0.0"
   json_serializable: ^6.4.0
   lints: ^5.0.0
   test: ^1.16.0