Bump ipykernel from 6.29.3 to 6.29.4 (#156)

Bumps [ipykernel](https://github.com/ipython/ipykernel) from 6.29.3 to
6.29.4.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/ipython/ipykernel/releases">ipykernel's
releases</a>.</em></p>
<blockquote>
<h2>v6.29.4</h2>
<h2>6.29.4</h2>
<p>(<a
href="https://github.com/ipython/ipykernel/compare/v6.29.3...1cea5332ffc37f32e8232fd2b8b8ddd91b2bbdcf">Full
Changelog</a>)</p>
<h3>Bugs fixed</h3>
<ul>
<li>Fix side effect import for pickleutil <a
href="https://redirect.github.com/ipython/ipykernel/pull/1216">#1216</a>
(<a
href="https://github.com/blink1073"><code>@​blink1073</code></a>)</li>
</ul>
<h3>Maintenance and upkeep improvements</h3>
<ul>
<li>Do not import debugger/debugpy unless needed <a
href="https://redirect.github.com/ipython/ipykernel/pull/1223">#1223</a>
(<a
href="https://github.com/krassowski"><code>@​krassowski</code></a>)</li>
</ul>
<h3>Contributors to this release</h3>
<p>(<a
href="https://github.com/ipython/ipykernel/graphs/contributors?from=2024-02-26&amp;to=2024-03-27&amp;type=c">GitHub
contributors page for this release</a>)</p>
<p><a
href="https://github.com/search?q=repo%3Aipython%2Fipykernel+involves%3Aagronholm+updated%3A2024-02-26..2024-03-27&amp;type=Issues"><code>@​agronholm</code></a>
| <a
href="https://github.com/search?q=repo%3Aipython%2Fipykernel+involves%3Ablink1073+updated%3A2024-02-26..2024-03-27&amp;type=Issues"><code>@​blink1073</code></a>
| <a
href="https://github.com/search?q=repo%3Aipython%2Fipykernel+involves%3Adavidbrochart+updated%3A2024-02-26..2024-03-27&amp;type=Issues"><code>@​davidbrochart</code></a>
| <a
href="https://github.com/search?q=repo%3Aipython%2Fipykernel+involves%3Akrassowski+updated%3A2024-02-26..2024-03-27&amp;type=Issues"><code>@​krassowski</code></a>
| <a
href="https://github.com/search?q=repo%3Aipython%2Fipykernel+involves%3Aminrk+updated%3A2024-02-26..2024-03-27&amp;type=Issues"><code>@​minrk</code></a></p>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/ipython/ipykernel/blob/v6.29.4/CHANGELOG.md">ipykernel's
changelog</a>.</em></p>
<blockquote>
<h2>6.29.4</h2>
<p>(<a
href="https://github.com/ipython/ipykernel/compare/v6.29.3...1cea5332ffc37f32e8232fd2b8b8ddd91b2bbdcf">Full
Changelog</a>)</p>
<h3>Bugs fixed</h3>
<ul>
<li>Fix side effect import for pickleutil <a
href="https://redirect.github.com/ipython/ipykernel/pull/1216">#1216</a>
(<a
href="https://github.com/blink1073"><code>@​blink1073</code></a>)</li>
</ul>
<h3>Maintenance and upkeep improvements</h3>
<ul>
<li>Do not import debugger/debugpy unless needed <a
href="https://redirect.github.com/ipython/ipykernel/pull/1223">#1223</a>
(<a
href="https://github.com/krassowski"><code>@​krassowski</code></a>)</li>
</ul>
<h3>Contributors to this release</h3>
<p>(<a
href="https://github.com/ipython/ipykernel/graphs/contributors?from=2024-02-26&amp;to=2024-03-27&amp;type=c">GitHub
contributors page for this release</a>)</p>
<p><a
href="https://github.com/search?q=repo%3Aipython%2Fipykernel+involves%3Aagronholm+updated%3A2024-02-26..2024-03-27&amp;type=Issues"><code>@​agronholm</code></a>
| <a
href="https://github.com/search?q=repo%3Aipython%2Fipykernel+involves%3Ablink1073+updated%3A2024-02-26..2024-03-27&amp;type=Issues"><code>@​blink1073</code></a>
| <a
href="https://github.com/search?q=repo%3Aipython%2Fipykernel+involves%3Adavidbrochart+updated%3A2024-02-26..2024-03-27&amp;type=Issues"><code>@​davidbrochart</code></a>
| <a
href="https://github.com/search?q=repo%3Aipython%2Fipykernel+involves%3Akrassowski+updated%3A2024-02-26..2024-03-27&amp;type=Issues"><code>@​krassowski</code></a>
| <a
href="https://github.com/search?q=repo%3Aipython%2Fipykernel+involves%3Aminrk+updated%3A2024-02-26..2024-03-27&amp;type=Issues"><code>@​minrk</code></a></p>
<!-- raw HTML omitted -->
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/ipython/ipykernel/commit/4dc77d783563b04972711e3b435595d3ddb5c689"><code>4dc77d7</code></a>
Publish 6.29.4</li>
<li><a
href="https://github.com/ipython/ipykernel/commit/1cea5332ffc37f32e8232fd2b8b8ddd91b2bbdcf"><code>1cea533</code></a>
Backport PR <a
href="https://redirect.github.com/ipython/ipykernel/issues/1223">#1223</a>
on branch 6.x (Do not import debugger/debugpy unless needed...</li>
<li><a
href="https://github.com/ipython/ipykernel/commit/384bdb13256a5eb0bf18a3d78969f3f0dceeaa2c"><code>384bdb1</code></a>
Fix side effect import for pickleutil (<a
href="https://redirect.github.com/ipython/ipykernel/issues/1216">#1216</a>)</li>
<li>See full diff in <a
href="https://github.com/ipython/ipykernel/compare/v6.29.3...v6.29.4">compare
view</a></li>
</ul>
</details>
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