Bump indexmap from 1.9.0 to 1.9.1 (#2139)

Bumps [indexmap](https://github.com/bluss/indexmap) from 1.9.0 to 1.9.1.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/bluss/indexmap/blob/master/RELEASES.md">indexmap's changelog</a>.</em></p>
<blockquote>
<ul>
<li>
<p>1.9.1</p>
<ul>
<li>The MSRV now allows Rust 1.56.0 as well. However, currently <code>hashbrown</code>
0.12.1 requires 1.56.1, so users on 1.56.0 should downgrade that to 0.12.0
until there is a later published version relaxing its requirement.</li>
</ul>
</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="a638b9910b"><code>a638b99</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/bluss/indexmap/issues/233">#233</a> from cuviper/release-1.9.1</li>
<li><a href="3f6cdde72a"><code>3f6cdde</code></a> Release 1.9.1</li>
<li><a href="3f8381a4e8"><code>3f8381a</code></a> Run CI on 1.56.1 until next hashbrown release</li>
<li><a href="24a0c8fafd"><code>24a0c8f</code></a> Revert &quot;Bump MSRV to 1.56.1, matching hashbrown as of 0.12.1&quot;</li>
<li><a href="844750f009"><code>844750f</code></a> Fix the RELEASES.md link</li>
<li>See full diff in <a href="https://github.com/bluss/indexmap/compare/1.9.0...1.9.1">compare view</a></li>
</ul>
</details>
<br />


[![Dependabot compatibility score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=indexmap&package-manager=cargo&previous-version=1.9.0&new-version=1.9.1)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)

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</details>

Cargo.lock

@@ -792,9 +792,9 @@ dependencies = [
 
 [[package]]
 name = "indexmap"
-version = "1.9.0"
+version = "1.9.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6c6392766afd7964e2531940894cffe4bd8d7d17dbc3c1c4857040fd4b33bdb3"
+checksum = "10a35a97730320ffe8e2d410b5d3b69279b98d2c14bdb8b70ea89ecf7888d41e"
 dependencies = [
  "autocfg",
  "hashbrown 0.12.1",

boa_engine/Cargo.toml

@@ -42,7 +42,7 @@ rustc-hash = "1.1.0"
 num-bigint = { version = "0.4.3", features = ["serde"] }
 num-integer = "0.1.45"
 bitflags = "1.3.2"
-indexmap = "1.9.0"
+indexmap = "1.9.1"
 ryu-js = "0.2.2"
 chrono = "0.4.19"
 fast-float = "0.2.0"