Bump gitpython from 3.1.18 to 3.1.30 in /examples/research_projects/decision_transformer
Bumps [gitpython](https://github.com/gitpython-developers/GitPython) from 3.1.18 to 3.1.30.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/gitpython-developers/GitPython/releases">gitpython's releases</a>.</em></p>
<blockquote>
<h2>v3.1.30 - with important security fixes</h2>
<p>See <a href="https://github-redirect.dependabot.com/gitpython-developers/GitPython/issues/1515">gitpython-developers/GitPython#1515</a> for details.</p>
<h2>3.1.20</h2>
<p>No release notes provided.</p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/gitpython-developers/GitPython/commit/141cd651e459bff8919798b3ccf03dfa167757f6"><code>141cd65</code></a> adjust changelog prior to release</li>
<li><a href="https://github.com/gitpython-developers/GitPython/commit/678a8fe08dd466fcfe8676294b52887955138960"><code>678a8fe</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/gitpython-developers/GitPython/issues/1521">#1521</a> from stsewd/block-insecure-options</li>
<li><a href="https://github.com/gitpython-developers/GitPython/commit/ae6a6e4b088a35c0fc7b17940722c8a515f7bee7"><code>ae6a6e4</code></a> Fix type hint on create_tag</li>
<li><a href="https://github.com/gitpython-developers/GitPython/commit/5bce9b4f7fc825d8bcd450325e6dda78c49f0ca0"><code>5bce9b4</code></a> Document PushInfoList</li>
<li><a href="https://github.com/gitpython-developers/GitPython/commit/f4f2658d5d308b3fb9162e50cd4c7b346e7a0a47"><code>f4f2658</code></a> Updates from review</li>
<li><a href="https://github.com/gitpython-developers/GitPython/commit/9dc43926207b2205d77511c6ffd40944199f0c2d"><code>9dc4392</code></a> Submodule tests</li>
<li><a href="https://github.com/gitpython-developers/GitPython/commit/c8ae33b9314a7d3716827b5cb705a3cd0a2e4a46"><code>c8ae33b</code></a> More tests</li>
<li><a href="https://github.com/gitpython-developers/GitPython/commit/b92f01a3a38fc8e171d08575c69de9733811faa6"><code>b92f01a</code></a> Update/add tests for Repo.clone*</li>
<li><a href="https://github.com/gitpython-developers/GitPython/commit/fd2c6da5f82009398d241dc07603fbcd490ced29"><code>fd2c6da</code></a> Updates from review</li>
<li><a href="https://github.com/gitpython-developers/GitPython/commit/e6108c7997f5c8f7361b982959518e982b973230"><code>e6108c7</code></a> Block unsafe options and protocols by default</li>
<li>Additional commits viewable in <a href="https://github.com/gitpython-developers/GitPython/compare/3.1.18...3.1.30">compare view</a></li>
</ul>
</details>
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