build(deps): Bump prettyplease from 0.2.15 to 0.2.16 (#391)

Bumps [prettyplease](https://github.com/dtolnay/prettyplease) from 0.2.15 to 0.2.16.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/dtolnay/prettyplease/releases">prettyplease's releases</a>.</em></p>
<blockquote>
<h2>0.2.16</h2>
<ul>
<li>Update proc-macro2 to fix caching issue when using a rustc-wrapper such as sccache</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/dtolnay/prettyplease/commit/380c7b8c5a3d950b362930b93cd22f8a6445dc25"><code>380c7b8</code></a> Release 0.2.16</li>
<li><a href="https://github.com/dtolnay/prettyplease/commit/7b9b3507419283eec8cd311f967996b4bf4db5b5"><code>7b9b350</code></a> Pull in proc-macro2 sccache fix</li>
<li><a href="https://github.com/dtolnay/prettyplease/commit/987bea1eba35996ca0e8aeb3312d55d66017d16e"><code>987bea1</code></a> Merge pull request <a href="https://redirect.github.com/dtolnay/prettyplease/issues/65">#65</a> from dtolnay/testmatchguard</li>
<li><a href="https://github.com/dtolnay/prettyplease/commit/e5e95113081076381a84efe5d40129ad26a820b3"><code>e5e9511</code></a> Add test of parenthesization of struct lit in match guard</li>
<li><a href="https://github.com/dtolnay/prettyplease/commit/ae86c8ce7ea2404f34bf196bebec36f78d112995"><code>ae86c8c</code></a> Merge pull request <a href="https://redirect.github.com/dtolnay/prettyplease/issues/64">#64</a> from dtolnay/grouped</li>
<li><a href="https://github.com/dtolnay/prettyplease/commit/acdc42ebf603a98ba23281e7ce10f0d935c04bbc"><code>acdc42e</code></a> Look into invisible delimiters to determine exterior struct lit</li>
<li><a href="https://github.com/dtolnay/prettyplease/commit/b2f30c7f30f7c096bb6615b2aa6c4e4cbc4c8087"><code>b2f30c7</code></a> Merge pull request <a href="https://redirect.github.com/dtolnay/prettyplease/issues/63">#63</a> from dtolnay/structcond</li>
<li><a href="https://github.com/dtolnay/prettyplease/commit/157544394997788385b00c9f031b1b30ca1065da"><code>1575443</code></a> Add test of automatic parenthesization of braced structs in cond</li>
<li><a href="https://github.com/dtolnay/prettyplease/commit/11ebfab3c1a1b4a297d6b9496f28925e90c2999e"><code>11ebfab</code></a> Format with new rustfmt that handles let-else</li>
<li><a href="https://github.com/dtolnay/prettyplease/commit/91033e81b1b8f726d9e8bd24669803568d4da5e0"><code>91033e8</code></a> Give a variable name before passing boolean arg</li>
<li>Additional commits viewable in <a href="https://github.com/dtolnay/prettyplease/compare/0.2.15...0.2.16">compare view</a></li>
</ul>
</details>
<br />


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</details>

packages/proto-build/Cargo.toml

@@ -9,7 +9,7 @@ heck = "0.4.0"
 itertools = "0.12.0"
 log = "0.4.20"
 pretty_env_logger = "0.5.0"
-prettyplease = "0.2.15"
+prettyplease = "0.2.16"
 prost = "0.12.3"
 prost-build = "0.12.3"
 prost-types = "0.12.3"