Bump serde_json from 1.0.105 to 1.0.106 in /packer (#5128)

Summary:
Bumps [serde_json](https://github.com/serde-rs/json) from 1.0.105 to 1.0.106.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/serde-rs/json/releases">serde_json's releases</a>.</em></p>
<blockquote>
<h2>v1.0.106</h2>
<ul>
<li>Add <code>Value::as_number</code> accessor (<a href="https://redirect.github.com/serde-rs/json/issues/1069">https://github.com/facebook/flipper/issues/1069</a>, thanks <a href="https://github.com/chanced"><code>@​chanced</code></a>)</li>
<li>Add <code>Number::as_str</code> accessor under &quot;arbitrary_precision&quot; feature (<a href="https://redirect.github.com/serde-rs/json/issues/1067">https://github.com/facebook/flipper/issues/1067</a>, thanks <a href="https://github.com/chanced"><code>@​chanced</code></a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/serde-rs/json/commit/45f10ec816e3f2765ac08f7ca73752326b0475d7"><code>45f10ec</code></a> Release 1.0.106</li>
<li><a href="https://github.com/serde-rs/json/commit/f346308cda4cd5a7dae0327a757fe41f064a2161"><code>f346308</code></a> Elaborate on documentation of Number::as_str</li>
<li><a href="https://github.com/serde-rs/json/commit/f16cad635d2aadb2ef6610e765f49eaabc1c9bf1"><code>f16cad6</code></a> Add cfg banner to documentation of Number::as_str</li>
<li><a href="https://github.com/serde-rs/json/commit/fc8dd13aa284d255b79504ed4ee15a27aba6228f"><code>fc8dd13</code></a> Touch up PR 1067</li>
<li><a href="https://github.com/serde-rs/json/commit/028b6439309e1fa910e380a24194c273313d0ba3"><code>028b643</code></a> Merge pull request <a href="https://redirect.github.com/serde-rs/json/issues/1067">https://github.com/facebook/flipper/issues/1067</a> from chanced/add-as_str-to-number</li>
<li><a href="https://github.com/serde-rs/json/commit/db75c22990f58c77d380c9dc02caa43e42b5b098"><code>db75c22</code></a> Fix unintended u8 link inferred by intra doc link</li>
<li><a href="https://github.com/serde-rs/json/commit/11b603cf07b6298cdec9803ef0b32085e43c335c"><code>11b603c</code></a> Resolve rustdoc::redundant_explicit_links lint</li>
<li><a href="https://github.com/serde-rs/json/commit/95c5d6c8be64634d9bf408ef9679003e6b6f0220"><code>95c5d6c</code></a> Fix documentation typo from PR 1069</li>
<li><a href="https://github.com/serde-rs/json/commit/5a39516161ea9efd7957e2b6c6c8fa76792026a9"><code>5a39516</code></a> Reorder Value::as_number after is_number</li>
<li><a href="https://github.com/serde-rs/json/commit/6a5fef919092c11a9a4eb827ac51001761795fe0"><code>6a5fef9</code></a> Wrap as_number documentation to 80 columns</li>
<li>Additional commits viewable in <a href="https://github.com/serde-rs/json/compare/v1.0.105...v1.0.106">compare view</a></li>
</ul>
</details>
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</details>

Pull Request resolved: #5128

Reviewed By: antonk52

Differential Revision: D49313905

Pulled By: passy

fbshipit-source-id: 24eab521c3f0f0957db740854e614d94d0c13ef8