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="d8311be182"><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="52c25ccdbe"><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="d3cee99201"><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="c8361edfe2"><code>c8361ed</code></a> emoji</li>
<li><a href="4676207191"><code>4676207</code></a> Limited union support</li>
<li><a href="64d073270f"><code>64d0732</code></a> Mention pubspec</li>
<li><a href="6d404a3e31"><code>6d404a3</code></a> Initial release</li>
<li><a href="7d413a1fa9"><code>7d413a1</code></a> Lints</li>
<li><a href="9f35603916"><code>9f35603</code></a> Port</li>
<li><a href="0d72188a23"><code>0d72188</code></a> Delete more</li>
<li><a href="24bf8435dc"><code>24bf843</code></a> Delete stuff</li>
<li><a href="5f0b80c0b5"><code>5f0b80c</code></a> chore: update sponsors.svg</li>
<li><a href="505b32f415"><code>505b32f</code></a> chore: update sponsors.svg</li>
<li>Additional commits viewable in <a href="https://github.com/rrousselGit/freezed/compare/freezed-v2.5.7...freezed@v3.0.0-0.0.dev">compare view</a></li>
</ul>
</details>
<br />

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting `@dependabot rebase`.

---

<details>
<summary>Dependabot commands and options</summary>
<br />

You can trigger Dependabot actions by commenting on this PR:
- `@dependabot rebase` will rebase this PR
- `@dependabot recreate` will recreate this PR, overwriting any edits that have been made to it
- `@dependabot merge` will merge this PR after your CI passes on it
- `@dependabot squash and merge` will squash and merge this PR after your CI passes on it
- `@dependabot cancel merge` will cancel a previously requested merge and block automerging
- `@dependabot reopen` will reopen this PR if it is closed
- `@dependabot close` will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
- `@dependabot show <dependency name> ignore conditions` will show all of the ignore conditions of the specified dependency
- `@dependabot ignore this major version` will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
- `@dependabot ignore this minor version` will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
- `@dependabot ignore this dependency` will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)

</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