chore(deps): Bump serde_yaml from 0.9.19 to 0.9.20 (#631)

Bumps [serde_yaml](https://github.com/dtolnay/serde-yaml) from 0.9.19 to
0.9.20.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/dtolnay/serde-yaml/releases">serde_yaml's
releases</a>.</em></p>
<blockquote>
<h2>0.9.20</h2>
<ul>
<li>Allow an empty YAML document to deserialize to <code>None</code> or
<code>Value::Null</code>, in addition to the previously supported empty
vector, empty map, and struct with no required fields</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="f833329ea3"><code>f833329</code></a>
Release 0.9.20</li>
<li><a
href="2a25cb7ee9"><code>2a25cb7</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/serde-yaml/issues/365">#365</a>
from dtolnay/empty</li>
<li><a
href="0d98534dda"><code>0d98534</code></a>
Allow empty document to be deserialized using visit_none</li>
<li><a
href="c4ac687cee"><code>c4ac687</code></a>
Add test of deserializing empty document to Option</li>
<li><a
href="8353dbfc7f"><code>8353dbf</code></a>
Ignore similar_names pedantic clippy lint</li>
<li><a
href="234272f9d1"><code>234272f</code></a>
Update test_de to test multi-document mode</li>
<li><a
href="69b5272bb0"><code>69b5272</code></a>
Update test_error to test same errors in multi-document mode</li>
<li><a
href="48fc779b90"><code>48fc779</code></a>
Update fuzz crate gitignore to ignore coverage dir</li>
<li>See full diff in <a
href="https://github.com/dtolnay/serde-yaml/compare/0.9.19...0.9.20">compare
view</a></li>
</ul>
</details>
<br />


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Cargo.lock

@@ -2223,9 +2223,9 @@ dependencies = [
 
 [[package]]
 name = "serde_yaml"
-version = "0.9.19"
+version = "0.9.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f82e6c8c047aa50a7328632d067bcae6ef38772a79e28daf32f735e0e4f3dd10"
+checksum = "0feade41f4649f0549d22df8c0432b2c25128b50f5d926b22173022e25b7c69e"
 dependencies = [
  "indexmap",
  "itoa",