Bump thiserror from 1.0.50 to 1.0.51 (#2881)

Bumps [thiserror](https://github.com/dtolnay/thiserror) from 1.0.50 to
1.0.51.
<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>1.0.51</h2>
<ul>
<li>Improve diagnostics when an invalid attribute previously caused
thiserror to generate no <code>Error</code> impl (<a
href="https://redirect.github.com/dtolnay/thiserror/issues/266">#266</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/dtolnay/thiserror/commit/0555b805916067d898356fd67a5384606fbf8414"><code>0555b80</code></a>
Release 1.0.51</li>
<li><a
href="https://github.com/dtolnay/thiserror/commit/b94add8c9ba7c01c5c109413cc3fb00021a66792"><code>b94add8</code></a>
Add ui test where fallback impl conflicts with handwritten Display</li>
<li><a
href="https://github.com/dtolnay/thiserror/commit/02c6a5548072646d27e850d782f76c2473f4fb25"><code>02c6a55</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/thiserror/issues/266">#266</a>
from dtolnay/fallback</li>
<li><a
href="https://github.com/dtolnay/thiserror/commit/1754825c24f51a1deec46a273b37c0fea32881f3"><code>1754825</code></a>
Work around trivial bounds being unstable</li>
<li><a
href="https://github.com/dtolnay/thiserror/commit/1567f40ec3c00d2f228bd3b71e0f583ef5e52e88"><code>1567f40</code></a>
Try to remove &quot;doesn't implement Debug&quot; in fallback
expansion</li>
<li><a
href="https://github.com/dtolnay/thiserror/commit/d7e3bdd980520731862d8bcd83ad1955355b1bd3"><code>d7e3bdd</code></a>
Fix redundant &quot;Error doesn't implement Display&quot; in
fallback</li>
<li><a
href="https://github.com/dtolnay/thiserror/commit/7e5ff62806e75a89f92980420d64c4a460cb6751"><code>7e5ff62</code></a>
Emit an Error impl even in the presence of bad attributes</li>
<li><a
href="https://github.com/dtolnay/thiserror/commit/0444cd5e66bd3fcdb2aefe9baeda8beb4c21178e"><code>0444cd5</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/thiserror/issues/265">#265</a>
from dtolnay/fallbackfixme</li>
<li><a
href="https://github.com/dtolnay/thiserror/commit/b010e52359f3e68d29eff4b08a2890bac3fc1644"><code>b010e52</code></a>
Add test looking for invalid input to still generate an impl</li>
<li><a
href="https://github.com/dtolnay/thiserror/commit/1c6c4bb593f15e79c65fc45dcdf78ce20da0cbbe"><code>1c6c4bb</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/thiserror/issues/264">#264</a>
from dtolnay/errortraitpath</li>
<li>Additional commits viewable in <a
href="https://github.com/dtolnay/thiserror/compare/1.0.50...1.0.51">compare
view</a></li>
</ul>
</details>
<br />


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