build(deps): Bump proc-macro2 from 1.0.88 to 1.0.89 (#604)

Bumps [proc-macro2](https://github.com/dtolnay/proc-macro2) from 1.0.88
to 1.0.89.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/dtolnay/proc-macro2/releases">proc-macro2's
releases</a>.</em></p>
<blockquote>
<h2>1.0.89</h2>
<ul>
<li>Ensure OUT_DIR is left with deterministic contents after build
script execution (<a
href="https://redirect.github.com/dtolnay/proc-macro2/issues/474">#474</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/671d87da32779e3a5c4cecacd8a9234e0e27630c"><code>671d87d</code></a>
Release 1.0.89</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/9574d983aea667b9c4d7a744212df5fc00daef1f"><code>9574d98</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/proc-macro2/issues/474">#474</a>
from dtolnay/outdir</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/3e8962cc14b0af47f0b07beeab2a560447f969f4"><code>3e8962c</code></a>
Clean up dep-info files from OUT_DIR</li>
<li>See full diff in <a
href="https://github.com/dtolnay/proc-macro2/compare/1.0.88...1.0.89">compare
view</a></li>
</ul>
</details>
<br />


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