Bump marshmallow from 3.26.1 to 3.26.2 in /examples/published-library/my-task-library (#555)

Bumps [marshmallow](https://github.com/marshmallow-code/marshmallow)
from 3.26.1 to 3.26.2.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/marshmallow-code/marshmallow/blob/dev/CHANGELOG.rst">marshmallow's
changelog</a>.</em></p>
<blockquote>
<h2>3.26.2 (2025-12-19)</h2>
<p>Bug fixes:</p>
<ul>
<li>:cve:<code>2025-68480</code>: Merge error store messages without
rebuilding collections.
Thanks 카푸치노 for reporting and :user:<code>deckar01</code> for the
fix.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/marshmallow-code/marshmallow/commit/1407d5102ae020421ddc8425474e976325a9539e"><code>1407d51</code></a>
Merge pull request <a
href="https://redirect.github.com/marshmallow-code/marshmallow/issues/2878">#2878</a>
from marshmallow-code/3.x-mypy-unreachable</li>
<li><a
href="https://github.com/marshmallow-code/marshmallow/commit/b2292f513845ccbd134bd55501a9bcbcdd18f8ac"><code>b2292f5</code></a>
Fix mypy errors</li>
<li><a
href="https://github.com/marshmallow-code/marshmallow/commit/8acd211847244fa28e0174728ff310fddf0d7fa2"><code>8acd211</code></a>
Merge pull request <a
href="https://redirect.github.com/marshmallow-code/marshmallow/issues/2877">#2877</a>
from marshmallow-code/3.x-delint</li>
<li><a
href="https://github.com/marshmallow-code/marshmallow/commit/b4bcb4a96f16a3b94c1b52ac82a66b57bbee1d88"><code>b4bcb4a</code></a>
[pre-commit.ci] auto fixes from pre-commit.com hooks</li>
<li><a
href="https://github.com/marshmallow-code/marshmallow/commit/b78af7a0ea3102f8c2379bebe115a015e4018a62"><code>b78af7a</code></a>
Delint</li>
<li><a
href="https://github.com/marshmallow-code/marshmallow/commit/2c4451e5129411da79161add51cfc76fe852549d"><code>2c4451e</code></a>
Merge commit from fork</li>
<li><a
href="https://github.com/marshmallow-code/marshmallow/commit/86d101a1aee2fe0a521c976015d1940437493cde"><code>86d101a</code></a>
Bump version and update changelog</li>
<li><a
href="https://github.com/marshmallow-code/marshmallow/commit/489a8d421dc7955bb53b89e962d69465fbc5b6af"><code>489a8d4</code></a>
Only deep copy error message collections</li>
<li><a
href="https://github.com/marshmallow-code/marshmallow/commit/6d4a17dad54ea9711040c6aa6ba4d59267242a41"><code>6d4a17d</code></a>
Add test coverage for error message modification</li>
<li><a
href="https://github.com/marshmallow-code/marshmallow/commit/0356a3f1c307830f8ded56d823abca5611c594c9"><code>0356a3f</code></a>
Merge error store messages without rebuilding collections</li>
<li>Additional commits viewable in <a
href="https://github.com/marshmallow-code/marshmallow/compare/3.26.1...3.26.2">compare
view</a></li>
</ul>
</details>
<br />


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