Bump shellexpand from 2.1.2 to 3.1.0 in /packer (#4640)

Summary:
Bumps [shellexpand](https://gitlab.com/ijackson/rust-shellexpand) from 2.1.2 to 3.1.0.
<details>
<summary>Commits</summary>
<ul>
<li><a href="b8d99fca87"><code>b8d99fc</code></a> Merge branch 'release' into 'main'</li>
<li><a href="1e14162d48"><code>1e14162</code></a> Declare version 3.1.0</li>
<li><a href="692b419f8d"><code>692b419</code></a> Fix theoretical bug in str::strip_prefix</li>
<li><a href="644df9f4c2"><code>644df9f</code></a> Rename latest CI test to latest-deps</li>
<li><a href="20be8b8d4c"><code>20be8b8</code></a> Document deps updates</li>
<li><a href="9e7a99369f"><code>9e7a993</code></a> Merge branch 'msrv' into 'main'</li>
<li><a href="3946ad227b"><code>3946ad2</code></a> Document new features and MSRV changes in changelog</li>
<li><a href="ffb5036e1d"><code>ffb5036</code></a> State an MSRV policy</li>
<li><a href="fc731ae496"><code>fc731ae</code></a> Usually test with supplied Cargo.lock.example</li>
<li><a href="9c686723a0"><code>9c68672</code></a> Break out feature-matrix tests</li>
<li>Additional commits viewable in <a href="https://gitlab.com/ijackson/rust-shellexpand/compare/shellexpand/2.1.2...shellexpand-3.1.0">compare view</a></li>
</ul>
</details>
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</details>

Pull Request resolved: https://github.com/facebook/flipper/pull/4640

Reviewed By: antonk52

Differential Revision: D45079162

Pulled By: passy

fbshipit-source-id: 4547f921fd839d3b9af3a4b95aa76200de41f87b

packer/Cargo.toml

@@ -11,7 +11,7 @@ edition = "2021"
 
 [dependencies]
 clap = { version = "^3", features = ["derive", "cargo"] }
-shellexpand = "^2"
+shellexpand = "^3"
 tar = "0.4.38"
 serde = { version = "^1", features = ["derive"] }
 serde_yaml = "0.9.21"