Bump proc-macro2 from 1.0.92 to 1.0.93 (#2605)

Bumps [proc-macro2](https://github.com/dtolnay/proc-macro2) from 1.0.92
to 1.0.93.
<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>1.0.93</h2>
<ul>
<li>Optimize TokenStream's Drop (<a
href="https://redirect.github.com/dtolnay/proc-macro2/issues/489">#489</a>,
<a
href="https://redirect.github.com/dtolnay/proc-macro2/issues/490">#490</a>,
thanks <a
href="https://github.com/WalkerKnapp"><code>@​WalkerKnapp</code></a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/83519e88337217c75794935381de61ab02c60a9b"><code>83519e8</code></a>
Release 1.0.93</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/87e04d21d9e7af4b1af069aac7c74207cddfa7e1"><code>87e04d2</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/proc-macro2/issues/490">#490</a>
from dtolnay/fastdrop</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/029360d69b15458a206067811dffc295a0fd1a72"><code>029360d</code></a>
Drop tokens in order instead of reversed order</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/172907a8554f6947e7b7e14a262c7e2914f31016"><code>172907a</code></a>
Non-recursively drop TokenStream relocating only streams, not
tokens</li>
<li>See full diff in <a
href="https://github.com/dtolnay/proc-macro2/compare/1.0.92...1.0.93">compare
view</a></li>
</ul>
</details>
<br />


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