Bump mistune from 0.8.4 to 2.0.3 in /examples/research_projects/visual_bert
Bumps [mistune](https://github.com/lepture/mistune) from 0.8.4 to 2.0.3.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/lepture/mistune/releases">mistune's releases</a>.</em></p>
<blockquote>
<h2>Version 2.0.2</h2>
<p>Fix <code>escape_url </code> via <a href="https://github-redirect.dependabot.com/lepture/mistune/pull/295">lepture/mistune#295</a></p>
<h2>Version 2.0.1</h2>
<p>Fix XSS for image link syntax.</p>
<h2>Version 2.0.0</h2>
<p>First release of Mistune v2.</p>
<h2>Version 2.0.0 RC1</h2>
<p>In this release, we have a <strong>Security Fix</strong> for harmful links.</p>
<h2>Version 2.0.0 Alpha 1</h2>
<p>This is the first release of v2. An alpha version for users to have a preview of the new mistune.</p>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/lepture/mistune/blob/master/docs/changes.rst">mistune's changelog</a>.</em></p>
<blockquote>
<h2>Changelog</h2>
<p>Here is the full history of mistune v2.</p>
<p>Version 2.0.4</p>
<pre><code>
Released on Jul 15, 2022
<ul>
<li>Fix <code>url</code> plugin in <code>&amp;lt;a&amp;gt;</code> tag</li>
<li>Fix <code>*</code> formatting</li>
</ul>
<p>Version 2.0.3
</code></pre></p>
<p>Released on Jun 27, 2022</p>
<ul>
<li>Fix <code>table</code> plugin</li>
<li>Security fix for CVE-2022-34749</li>
</ul>
<p>Version 2.0.2</p>
<pre><code>
Released on Jan 14, 2022
<p>Fix <code>escape_url</code></p>
<p>Version 2.0.1
</code></pre></p>
<p>Released on Dec 30, 2021</p>
<p>XSS fix for image link syntax.</p>
<p>Version 2.0.0</p>
<pre><code>
Released on Dec 5, 2021
<p>This is the first non-alpha release of mistune v2.</p>
<p>Version 2.0.0rc1
</code></pre></p>
<p>Released on Feb 16, 2021</p>
<p>Version 2.0.0a6</p>
<pre><code>
&lt;/tr&gt;&lt;/table&gt; 
</code></pre>
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/lepture/mistune/commit/3f422f1e84edae0f39756c45be453ecde534b755"><code>3f422f1</code></a> Version bump 2.0.3</li>
<li><a href="https://github.com/lepture/mistune/commit/a6d43215132fe4f3d93f8d7e90ba83b16a0838b2"><code>a6d4321</code></a> Fix asteris emphasis regex CVE-2022-34749</li>
<li><a href="https://github.com/lepture/mistune/commit/5638e460459cb59ceb20e4ce4716c802d4d73c53"><code>5638e46</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/lepture/mistune/issues/307">#307</a> from jieter/patch-1</li>
<li><a href="https://github.com/lepture/mistune/commit/0eba47196a81453bafe1f2492748a87475063dff"><code>0eba471</code></a> Fix typo in guide.rst</li>
<li><a href="https://github.com/lepture/mistune/commit/61e9337884e20f9f8fdc0b7788d319afdd259729"><code>61e9337</code></a> Fix table plugin</li>
<li><a href="https://github.com/lepture/mistune/commit/76dec68c4514c2612ef9263b49c6ec7f4d77bd14"><code>76dec68</code></a> Add documentation for renderer heading when TOC enabled</li>
<li><a href="https://github.com/lepture/mistune/commit/799cd118cc5e664b72e98410ce1b68645f1a38c0"><code>799cd11</code></a> Version bump 2.0.2</li>
<li><a href="https://github.com/lepture/mistune/commit/babb0cfa57a983ead615286a2b7c8f6885c46721"><code>babb0cf</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/lepture/mistune/issues/295">#295</a> from dairiki/bug.escape_url</li>
<li><a href="https://github.com/lepture/mistune/commit/fc2cd53d7698e432ab5b250ffac53458263a49e2"><code>fc2cd53</code></a> Make mistune.util.escape_url less aggressive</li>
<li><a href="https://github.com/lepture/mistune/commit/3e8d35215120ac82176f300dd5e20c0bea5464ea"><code>3e8d352</code></a> Version bump 2.0.1</li>
<li>Additional commits viewable in <a href="https://github.com/lepture/mistune/compare/v0.8.4...v2.0.3">compare view</a></li>
</ul>
</details>
<br />


[![Dependabot compatibility score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=mistune&package-manager=pip&previous-version=0.8.4&new-version=2.0.3)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)

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`.

[//]: # (dependabot-automerge-start)
[//]: # (dependabot-automerge-end)

---

<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 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)
- `@dependabot use these labels` will set the current labels as the default for future PRs for this repo and language
- `@dependabot use these reviewers` will set the current reviewers as the default for future PRs for this repo and language
- `@dependabot use these assignees` will set the current assignees as the default for future PRs for this repo and language
- `@dependabot use this milestone` will set the current milestone as the default for future PRs for this repo and language

You can disable automated security fix PRs for this repo from the [Security Alerts page](https://github.com/huggingface/transformers/network/alerts).

</details>
_The documentation is not available anymore as the PR was closed or merged._