Bump thiserror from 1.0.59 to 1.0.60 (#3158)

Bumps [thiserror](https://github.com/dtolnay/thiserror) from 1.0.59 to
1.0.60.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/dtolnay/thiserror/releases">thiserror's
releases</a>.</em></p>
<blockquote>
<h2>1.0.60</h2>
<ul>
<li>Resolve unexpected_cfgs warning (<a
href="https://redirect.github.com/dtolnay/thiserror/issues/298">#298</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/dtolnay/thiserror/commit/870d11b830e7f1ce0ad6c1656806a7fcdd4273df"><code>870d11b</code></a>
Release 1.0.60</li>
<li><a
href="https://github.com/dtolnay/thiserror/commit/0ccee7c2a1741d4e9a1973475cd54277891a1d92"><code>0ccee7c</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/thiserror/issues/298">#298</a>
from dtolnay/checkcfg</li>
<li><a
href="https://github.com/dtolnay/thiserror/commit/cf43d0c1302f1ee073a7062b2dc24123589a4417"><code>cf43d0c</code></a>
Resolve unexpected_cfgs warning</li>
<li>See full diff in <a
href="https://github.com/dtolnay/thiserror/compare/1.0.59...1.0.60">compare
view</a></li>
</ul>
</details>
<br />


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