build(deps): Bump proc-macro2 from 1.0.82 to 1.0.83 (#546)

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Bumps [proc-macro2](https://github.com/dtolnay/proc-macro2) from 1.0.82
to 1.0.83.
<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>1.0.83</h2>
<ul>
<li>Optimize the representation of <code>Ident</code> (<a
href="https://redirect.github.com/dtolnay/proc-macro2/issues/462">#462</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/1b77aca69bb7a306a5c03421ecc58ca158acebed"><code>1b77aca</code></a>
Release 1.0.83</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/728eddf8cbcc92880664afb551c8accb920ad73a"><code>728eddf</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/proc-macro2/issues/462">#462</a>
from dtolnay/identsize</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/c56c5e69ebd7790173c2be3f0bc82f0f6da7bfd4"><code>c56c5e6</code></a>
Drop irrelevant capacity field from Ident representation</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/464c2eb779d1b9a29a3bf513fc9285e90e22d4a8"><code>464c2eb</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/proc-macro2/issues/461">#461</a>
from dtolnay/sizetest</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/6f894e73d2661f6e9dd8bc3e33b39a00ee023996"><code>6f894e7</code></a>
Disable span size tests when layout is randomized</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/7b357afc78f7f5a99d416b6cfcd40be806ce8062"><code>7b357af</code></a>
Add additional size tests</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/abc7dff3362d2ea0825bbe15d224db986fdac774"><code>abc7dff</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/proc-macro2/issues/460">#460</a>
from dtolnay/docsrs</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/f8d88f3ca40985d00b6939e11483b99a74d5ee9c"><code>f8d88f3</code></a>
Rely on docs.rs to define --cfg=docsrs by default</li>
<li>See full diff in <a
href="https://github.com/dtolnay/proc-macro2/compare/1.0.82...1.0.83">compare
view</a></li>
</ul>
</details>
<br />


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