Bump num-bigint from 0.4.2 to 0.4.3 (#1699)

Bumps [num-bigint](https://github.com/rust-num/num-bigint) from 0.4.2 to 0.4.3.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/rust-num/num-bigint/blob/master/RELEASES.md">num-bigint's changelog</a>.</em></p>
<blockquote>
<h1>Release 0.4.3 (2021-11-02)</h1>
<ul>
<li><a href="https://github.com/rust-num/num-bigint/security/advisories/GHSA-v935-pqmr-g8v9">GHSA-v935-pqmr-g8v9</a>: <a href="https://github-redirect.dependabot.com/rust-num/num-bigint/pull/228">Fix unexpected panics in multiplication.</a></li>
</ul>
<p><strong>Contributors</strong>: <a href="https://github.com/arvidn"><code>@​arvidn</code></a>, <a href="https://github.com/cuviper"><code>@​cuviper</code></a>, <a href="https://github.com/guidovranken"><code>@​guidovranken</code></a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li>See full diff in <a href="https://github.com/rust-num/num-bigint/commits">compare view</a></li>
</ul>
</details>
<br />


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Cargo.lock

@@ -758,9 +758,9 @@ checksum = "72ef4a56884ca558e5ddb05a1d1e7e1bfd9a68d9ed024c21704cc98872dae1bb"
 
 [[package]]
 name = "num-bigint"
-version = "0.4.2"
+version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74e768dff5fb39a41b3bcd30bb25cf989706c90d028d1ad71971987aa309d535"
+checksum = "f93ab6289c7b344a8a9f60f88d80aa20032336fe78da341afc91c8a2341fc75f"
 dependencies = [
  "autocfg",
  "num-integer",

boa/Cargo.toml

@@ -30,7 +30,7 @@ rand = "0.8.4"
 num-traits = "0.2.14"
 regress = "0.4.1"
 rustc-hash = "1.1.0"
-num-bigint = { version = "0.4.2", features = ["serde"] }
+num-bigint = { version = "0.4.3", features = ["serde"] }
 num-integer = "0.1.44"
 bitflags = "1.3.2"
 indexmap = "1.7.0"