Bump react-markdown from 4.3.1 to 5.0.3 in /desktop (#1751)

Summary:
Bumps [react-markdown](https://github.com/remarkjs/react-markdown) from 4.3.1 to 5.0.3.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/remarkjs/react-markdown/blob/main/changelog.md">react-markdown's changelog</a>.</em></p>
<blockquote>
<h2>5.0.3 - 2020-10-23</h2>
<ul>
<li><a href="https://github.com/remarkjs/react-markdown/commit/bb0bdde"><code>bb0bdde</code></a>
Unlock peer dependency on React to allow v17</li>
<li><a href="https://github.com/remarkjs/react-markdown/commit/24e42bd"><code>24e42bd</code></a>
Fix exception on missing element from <code>html-to-react</code></li>
<li><a href="https://github.com/remarkjs/react-markdown/commit/3d363e9"><code>3d363e9</code></a>
Fix umd browser build</li>
</ul>
<h2>5.0.2 - 2020-10-23</h2>
<ul>
<li><a href="https://github.com/remarkjs/react-markdown/commit/4dadaba"><code>4dadaba</code></a>
Fix to allow combining <code>allowedTypes</code>, <code>unwrapDisallowed</code> in types</li>
</ul>
<h2>5.0.1 - 2020-10-21</h2>
<ul>
<li><a href="https://github.com/remarkjs/react-markdown/commit/c3dc5ee"><code>c3dc5ee</code></a>
Fix to not crash on empty text nodes</li>
</ul>
<h2>5.0.0 - 2020-10-19</h2>
<h3>BREAKING</h3>
<h4>Maintained by <a href="https://unifiedjs.com">unified</a></h4>
<p>This project is now maintained by the unified collective, which also houses the
underlying tools used in <code>react-markdown</code>: hundreds of projects for working with
markdown and markup related things (including MDX).
We have cleaned the project: updated dependencies, improved
docs/tests/coverage/types, cleaned the issue tracker, and fixed a couple of
bugs, but otherwise <em>much should be the same</em>.</p>
<h4>Upgrade <code>remark-parse</code></h4>
<p>The parser used in <code>react-markdown</code> has been upgraded to the latest version.
It is now 100% CommonMark compliant: that means it works the same as in other
places, such as Discourse, Reddit, Stack Overflow, and GitHub.
Note that GitHub does extend CommonMark: to match how Markdown works on GitHub,
use the <a href="https://github.com/remarkjs/remark-gfm"><code>remark-gfm</code></a> plugin.</p>
<ul>
<li><a href="https://github.com/remarkjs/remark/releases/tag/remark-parse%409.0.0"><code>remark-parse@9.0.0</code></a></li>
<li><a href="https://github.com/remarkjs/remark/releases/tag/remark-parse%408.0.0"><code>remark-parse@8.0.0</code></a></li>
<li><a href="https://github.com/remarkjs/remark/releases/tag/remark-parse%407.0.0"><code>remark-parse@7.0.0</code></a></li>
<li><a href="https://github.com/remarkjs/remark/releases/tag/remark-parse%406.0.0"><code>remark-parse@6.0.0</code></a></li>
</ul>
<h4>New serializer property: <code>node</code></h4>
<p>A new <code>node</code> prop is passed to all non-tag/non-fragment renderers.
This contains the raw <a href="https://github.com/syntax-tree/mdast">mdast</a> AST node,
which opens up a number of interesting possibilities.</p>

</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="22bb78747d"><code>22bb787</code></a> 5.0.3</li>
<li><a href="bb0bdded9f"><code>bb0bdde</code></a> Unlock peer dependency on React to allow v17</li>
<li><a href="816a52bc75"><code>816a52b</code></a> Use Actions</li>
<li><a href="6e2eb1c5b3"><code>6e2eb1c</code></a> Update dev-dependencies</li>
<li><a href="24e42bd14f"><code>24e42bd</code></a> Fix exception on missing element from <code>html-to-react</code></li>
<li><a href="3d363e9d07"><code>3d363e9</code></a> Fix umd browser build</li>
<li><a href="6e38dd343e"><code>6e38dd3</code></a> Update changelog</li>
<li><a href="62a683f18c"><code>62a683f</code></a> 5.0.2</li>
<li><a href="89bc8d8317"><code>89bc8d8</code></a> Add ignore comment</li>
<li><a href="4dadaba5ab"><code>4dadaba</code></a> Fix to allow combining <code>allowedTypes</code>, <code>unwrapDisallowed</code> in types</li>
<li>Additional commits viewable in <a href="https://github.com/remarkjs/react-markdown/compare/v4.3.1...5.0.3">compare view</a></li>
</ul>
</details>
<details>
<summary>Maintainer changes</summary>
<p>This version was pushed to npm by <a href="https://www.npmjs.com/~wooorm">wooorm</a>, a new releaser for react-markdown since your current version.</p>
</details>
<br />

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<details>
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</details>

Pull Request resolved: https://github.com/facebook/flipper/pull/1751

Reviewed By: mweststrate

Differential Revision: D25373134

Pulled By: passy

fbshipit-source-id: 3bc61c309b8db6da4c042b8943a6d338b84d932e

desktop/app/package.json

@@ -50,7 +50,7 @@
     "react-debounce-render": "^7.0.0",
     "react-dom": "^17.0.1",
     "react-element-to-jsx-string": "^14.3.1",
-    "react-markdown": "^4.2.2",
+    "react-markdown": "^5.0.3",
     "react-player": "^1.15.2",
     "react-redux": "^7.1.1",
     "react-test-renderer": "^17.0.1",