Bump serde_yaml from 0.8.14 to 0.8.15 in /packer (#1821)

Summary:
Bumps [serde_yaml](https://github.com/dtolnay/serde-yaml) from 0.8.14 to 0.8.15.
<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>0.8.15</h2>
<ul>
<li>Declare dependency version requirements compatible with minimal-versions lockfile (<a href="https://github-redirect.dependabot.com/dtolnay/serde-yaml/issues/183">https://github.com/facebook/flipper/issues/183</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="c3595c7261"><code>c3595c7</code></a> Release 0.8.15</li>
<li><a href="022b0ad89f"><code>022b0ad</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/dtolnay/serde-yaml/issues/184">https://github.com/facebook/flipper/issues/184</a> from dtolnay/minimal-versions</li>
<li><a href="e656edc0b7"><code>e656edc</code></a> Test minimal-versions in CI</li>
<li><a href="6df5a22c86"><code>6df5a22</code></a> Set version requirements compatible with -Z minimal-versions</li>
<li><a href="f6aa31d1f7"><code>f6aa31d</code></a> Fix catching clippy warnings as CI failures</li>
<li><a href="7f6d925e60"><code>7f6d925</code></a> Inform clippy of supported compiler version in clippy.toml</li>
<li><a href="c82a38dc7f"><code>c82a38d</code></a> Apply clippy to test suite</li>
<li><a href="7a04d41d24"><code>7a04d41</code></a> Extract clippy lint level to CI job</li>
<li><a href="a4105eaaf2"><code>a4105ea</code></a> Resolve clippy unnecessary_wraps lints</li>
<li>See full diff in <a href="https://github.com/dtolnay/serde-yaml/compare/0.8.14...0.8.15">compare view</a></li>
</ul>
</details>
<br />

[![Dependabot compatibility score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=serde_yaml&package-manager=cargo&previous-version=0.8.14&new-version=0.8.15)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)

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</details>

Pull Request resolved: https://github.com/facebook/flipper/pull/1821

Reviewed By: priteshrnandgaonkar

Differential Revision: D25870648

Pulled By: passy

fbshipit-source-id: f953878349dc84267fd90559644afdb3a53cedf0

packer/Cargo.toml

@@ -14,7 +14,7 @@ clap = "2.33.3"
 shellexpand = "2.1.0"
 tar = "0.4.30"
 serde = { version = "1.0.118", features = ["derive"] }
-serde_yaml = "0.8.13"
+serde_yaml = "0.8.15"
 anyhow = "1.0.37"
 sha2 = "^0.8.1"
 data-encoding = "2.3.1"