Bump nbconvert from 6.0.1 to 6.3.0 in /examples/research_projects/visual_bert
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[//]: # (dependabot-end)

Bumps [nbconvert](https://github.com/jupyter/nbconvert) from 6.0.1 to 6.3.0.
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/jupyter/nbconvert/commit/cefe0bfe303e5e9e194c393cb9280c64a77b8219"><code>cefe0bf</code></a> Release 6.3.0</li>
<li><a href="https://github.com/jupyter/nbconvert/commit/a534fb901ff83e0b0c0c082ff47f3de01dc651b1"><code>a534fb9</code></a> Release 6.3.0b0</li>
<li><a href="https://github.com/jupyter/nbconvert/commit/87920c5a47c8ae99600be6c9b9b909ba440adce9"><code>87920c5</code></a> Add changelog for 6.3.0 (<a href="https://github-redirect.dependabot.com/jupyter/nbconvert/issues/1669">#1669</a>)</li>
<li><a href="https://github.com/jupyter/nbconvert/commit/dd6d9c7d36d0a09db647a8fc993f7330388a1e48"><code>dd6d9c7</code></a> add slide numbering (<a href="https://github-redirect.dependabot.com/jupyter/nbconvert/issues/1654">#1654</a>)</li>
<li><a href="https://github.com/jupyter/nbconvert/commit/5d2c5e2b79534c11678b73e707feb74d7827a557"><code>5d2c5e2</code></a> Update state filter (<a href="https://github-redirect.dependabot.com/jupyter/nbconvert/issues/1664">#1664</a>)</li>
<li><a href="https://github.com/jupyter/nbconvert/commit/11ea5931f71fdaaaad8958f634132f45476bf006"><code>11ea593</code></a> fix: avoid closing the script tag early by escaping a forward slash (<a href="https://github-redirect.dependabot.com/jupyter/nbconvert/issues/1665">#1665</a>)</li>
<li><a href="https://github.com/jupyter/nbconvert/commit/968c5fbabaf99f83d64720a1a6e90969052e978c"><code>968c5fb</code></a> Fix HTML templates mentioned in help docs (<a href="https://github-redirect.dependabot.com/jupyter/nbconvert/issues/1653">#1653</a>)</li>
<li><a href="https://github.com/jupyter/nbconvert/commit/35c4d07eb7060b505412c0ad83886176fe8409fe"><code>35c4d07</code></a> Add a new output filter that excludes widgets if there is no state (<a href="https://github-redirect.dependabot.com/jupyter/nbconvert/issues/1643">#1643</a>)</li>
<li><a href="https://github.com/jupyter/nbconvert/commit/c663c75339709c0e1c051d684dba0cf10fa9083e"><code>c663c75</code></a> 6.2.0</li>
<li><a href="https://github.com/jupyter/nbconvert/commit/fd1dd15b63bfd898c21c90b78165c4c00c448896"><code>fd1dd15</code></a> 6.2.0rc2</li>
<li>Additional commits viewable in <a href="https://github.com/jupyter/nbconvert/compare/6.0.1...6.3.0">compare view</a></li>
</ul>
</details>
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