build(deps): Bump proc-macro2 from 1.0.81 to 1.0.82 (#538)

Bumps [proc-macro2](https://github.com/dtolnay/proc-macro2) from 1.0.81
to 1.0.82.
<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>1.0.82</h2>
<ul>
<li>Resolve unexpected_cfgs warning (<a
href="https://redirect.github.com/dtolnay/proc-macro2/issues/456">#456</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/8dc63f36f6735ff2e384e34422f57f393929f09f"><code>8dc63f3</code></a>
Release 1.0.82</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/790cb418978e41899c286752803a77ba8a817d20"><code>790cb41</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/proc-macro2/issues/457">#457</a>
from dtolnay/defaultfeatures</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/2ebe71180da1813be5dc3f77ce13020a49455c95"><code>2ebe711</code></a>
Fix use of deprecated default_features in Cargo.toml</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/a720819a80afd67b10062d819c742d7cb05934cc"><code>a720819</code></a>
Delete unused nightly cfg</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/37c5d18ec0e7b8a5c15cc3934ce136c2d2ee1220"><code>37c5d18</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/proc-macro2/issues/456">#456</a>
from dtolnay/checkcfg</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/5e02f52b954f40a4cb8f26020c3ff494c3c5426a"><code>5e02f52</code></a>
Suppress unknown_lints warning on old rustc</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/2660d3026a70e1478997c55044c76529ca157eda"><code>2660d30</code></a>
Resolve unexpected_cfgs warning</li>
<li>See full diff in <a
href="https://github.com/dtolnay/proc-macro2/compare/1.0.81...1.0.82">compare
view</a></li>
</ul>
</details>
<br />


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