Bump serde_yaml from 0.8.20 to 0.8.21 in /packer (#2846)

Summary:
Bumps [serde_yaml](https://github.com/dtolnay/serde-yaml) from 0.8.20 to 0.8.21.
<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>0.8.21</h2>
<ul>
<li>Avoid emitting surplus precision when serializing f32 (<a href="https://github-redirect.dependabot.com/dtolnay/serde-yaml/issues/214">https://github.com/facebook/flipper/issues/214</a>, thanks <a href="https://github.com/cheradenine"><code>@​cheradenine</code></a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="644be1654d"><code>644be16</code></a> Release 0.8.21</li>
<li><a href="4877180f10"><code>4877180</code></a> Clean up some strange absolute paths in serializer</li>
<li><a href="045dfedc1a"><code>045dfed</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/dtolnay/serde-yaml/issues/214">https://github.com/facebook/flipper/issues/214</a> from cheradenine/serialize-f32</li>
<li><a href="7d07fe6d7e"><code>7d07fe6</code></a> Adds test cases for f32 representations (inf and nan)</li>
<li><a href="c420357212"><code>c420357</code></a> Adds explicit serialization for f32 to avoid rounding artifacts when promotin...</li>
<li><a href="7a340b295b"><code>7a340b2</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/dtolnay/serde-yaml/issues/212">https://github.com/facebook/flipper/issues/212</a> from dtolnay/128</li>
<li><a href="0c6bca163a"><code>0c6bca1</code></a> Make 128 bit support unconditional</li>
<li>See full diff in <a href="https://github.com/dtolnay/serde-yaml/compare/0.8.20...0.8.21">compare view</a></li>
</ul>
</details>
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</details>

Pull Request resolved: https://github.com/facebook/flipper/pull/2846

Reviewed By: timur-valiev

Differential Revision: D30900760

Pulled By: mweststrate

fbshipit-source-id: 2e553a276e7cde9123a6374ef95064a9dcbe1fe4

packer/Cargo.lock

@@ -622,9 +622,9 @@ dependencies = [
 
 [[package]]
 name = "serde_yaml"
-version = "0.8.20"
+version = "0.8.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ad104641f3c958dab30eb3010e834c2622d1f3f4c530fef1dee20ad9485f3c09"
+checksum = "d8c608a35705a5d3cdc9fbe403147647ff34b921f8e833e49306df898f9b20af"
 dependencies = [
  "dtoa",
  "indexmap",

packer/Cargo.toml

@@ -14,7 +14,7 @@ clap = "2.33.3"
 shellexpand = "2.1.0"
 tar = "0.4.37"
 serde = { version = "1.0.130", features = ["derive"] }
-serde_yaml = "0.8.20"
+serde_yaml = "0.8.21"
 anyhow = "1.0.43"
 sha2 = "0.9.6"
 data-encoding = "2.3.2"