build(deps): bump indexmap from 2.8.0 to 2.9.0 (#36388)

Bumps [indexmap](https://github.com/indexmap-rs/indexmap) from 2.8.0 to
2.9.0.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/indexmap-rs/indexmap/blob/main/RELEASES.md">indexmap's
changelog</a>.</em></p>
<blockquote>
<h2>2.9.0 (2025-04-04)</h2>
<ul>
<li>Added a <code>get_disjoint_mut</code> method to
<code>IndexMap</code>, matching Rust 1.86's
<code>HashMap</code> method.</li>
<li>Added a <code>get_disjoint_indices_mut</code> method to
<code>IndexMap</code> and <code>map::Slice</code>,
matching Rust 1.86's <code>get_disjoint_mut</code> method on
slices.</li>
<li>Deprecated the <code>borsh</code> feature in favor of their own
<code>indexmap</code> feature,
solving a cyclic dependency that occured via
<code>borsh-derive</code>.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/indexmap-rs/indexmap/commit/1818d4140d86aeef18c515f1b060a3fa68da2708"><code>1818d41</code></a>
Merge pull request <a
href="https://redirect.github.com/indexmap-rs/indexmap/issues/387">#387</a>
from cuviper/release-2.9.0</li>
<li><a
href="https://github.com/indexmap-rs/indexmap/commit/9f4998341b2f7fad5624fdc1d92c2ca51f0dce64"><code>9f49983</code></a>
Release 2.9.0</li>
<li><a
href="https://github.com/indexmap-rs/indexmap/commit/582a90fda3326cb8e75f702a7251ea46bdd47d34"><code>582a90f</code></a>
Merge pull request <a
href="https://redirect.github.com/indexmap-rs/indexmap/issues/386">#386</a>
from cuviper/de-borsh</li>
<li><a
href="https://github.com/indexmap-rs/indexmap/commit/90117397b693d3794ce960fe1582ed247569d480"><code>9011739</code></a>
Deprecate the &quot;borsh&quot; feature</li>
<li><a
href="https://github.com/indexmap-rs/indexmap/commit/0a836e8648304ac3c29059aaae2569274530dab1"><code>0a836e8</code></a>
Merge pull request <a
href="https://redirect.github.com/indexmap-rs/indexmap/issues/238">#238</a>
from NiklasJonsson/get_many_mut</li>
<li><a
href="https://github.com/indexmap-rs/indexmap/commit/434d7ac6d122cf27dce979eb3888e362853dfb2d"><code>434d7ac</code></a>
Avoid let-else for MSRV's sake</li>
<li><a
href="https://github.com/indexmap-rs/indexmap/commit/5be552d557765a8ccc919185838067b3c77eab95"><code>5be552d</code></a>
Implement additional suggestions from review</li>
<li><a
href="https://github.com/indexmap-rs/indexmap/commit/4e1d8cef470b4d96380ebbb8bae8994db1d79f51"><code>4e1d8ce</code></a>
Address review feedback</li>
<li><a
href="https://github.com/indexmap-rs/indexmap/commit/5aec9ec674d40f2c2da74ef6a335353cc41092dc"><code>5aec9ec</code></a>
Implement get_disjoint_mut for arrays of keys</li>
<li><a
href="https://github.com/indexmap-rs/indexmap/commit/d10de30e74924c8f71f924a307ebca7678ba58e5"><code>d10de30</code></a>
Merge pull request <a
href="https://redirect.github.com/indexmap-rs/indexmap/issues/385">#385</a>
from iajoiner/docs/macros</li>
<li>Additional commits viewable in <a
href="https://github.com/indexmap-rs/indexmap/compare/2.8.0...2.9.0">compare
view</a></li>
</ul>
</details>
<br />


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