Upgrade: [dependabot] - bump boto3-stubs from 1.42.76 to 1.42.78 (#509)

Bumps [boto3-stubs](https://github.com/youtype/mypy_boto3_builder) from
1.42.76 to 1.42.78.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/youtype/mypy_boto3_builder/releases">boto3-stubs's
releases</a>.</em></p>
<blockquote>
<h2>8.8.0 - Python 3.8 runtime is back</h2>
<h3>Changed</h3>
<ul>
<li><code>[services]</code> <code>install_requires</code> section is
calculated based on dependencies in use, so
<code>typing-extensions</code> version is set properly</li>
<li><code>[all]</code> Replaced <code>typing</code> imports with
<code>collections.abc</code> with a fallback to <code>typing</code> for
Python &lt;3.9</li>
<li><code>[all]</code> Added aliases for <code>builtins.list</code>,
<code>builtins.set</code>, <code>builtins.dict</code>, and
<code>builtins.type</code>, so Python 3.8 runtime should work as
expected again (reported by <a
href="https://github.com/YHallouard"><code>@​YHallouard</code></a> in <a
href="https://redirect.github.com/youtype/mypy_boto3_builder/issues/340">#340</a>
and <a
href="https://github.com/Omri-Ben-Yair"><code>@​Omri-Ben-Yair</code></a>
in <a
href="https://redirect.github.com/youtype/mypy_boto3_builder/issues/336">#336</a>)</li>
<li><code>[all]</code> Unions use the same type annotations as the rest
of the structures due to proper fallbacks</li>
</ul>
<h3>Fixed</h3>
<ul>
<li><code>[services]</code> Universal input/output shapes were not
replaced properly in service subresources</li>
<li><code>[docs]</code> Simplified doc links rendering for services</li>
<li><code>[services]</code> Cleaned up unnecessary imports in
<code>client.pyi</code></li>
<li><code>[builder]</code> Import records with fallback are always
rendered</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li>See full diff in <a
href="https://github.com/youtype/mypy_boto3_builder/commits">compare
view</a></li>
</ul>
</details>
<br />

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]