Bump syn from 2.0.77 to 2.0.79 in the known_good_semver group (parity…

…tech#5864)

Bumps the known_good_semver group with 1 update:
[syn](https://github.com/dtolnay/syn).

Updates `syn` from 2.0.77 to 2.0.79
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/dtolnay/syn/releases">syn's
releases</a>.</em></p>
<blockquote>
<h2>2.0.79</h2>
<ul>
<li>Fix infinite loop on parsing chained ranges (<a
href="https://redirect.github.com/dtolnay/syn/issues/1741">#1741</a>)</li>
<li>Fix panic in parsing <code>use</code> items containing absolute
paths (<a
href="https://redirect.github.com/dtolnay/syn/issues/1742">#1742</a>)</li>
</ul>
<h2>2.0.78</h2>
<ul>
<li>Fix infinite loop on chained comparison (<a
href="https://redirect.github.com/dtolnay/syn/issues/1739">#1739</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/dtolnay/syn/commit/732e6e39406538aebe34ed5f5803113a48c28602"><code>732e6e3</code></a>
Release 2.0.79</li>
<li><a
href="https://github.com/dtolnay/syn/commit/af63396422250a1c7c80e6f12da08ce31ea435af"><code>af63396</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/syn/issues/1742">#1742</a>
from dtolnay/usecrateroot</li>
<li><a
href="https://github.com/dtolnay/syn/commit/31e863233872eb3f4239a25f42030c369c22d72b"><code>31e8632</code></a>
Fix construction of UseGroup containing crate roots</li>
<li><a
href="https://github.com/dtolnay/syn/commit/037861ac3ca6f91aec7f7c20811535488dafaec4"><code>037861a</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/syn/issues/1741">#1741</a>
from dtolnay/binoploop</li>
<li><a
href="https://github.com/dtolnay/syn/commit/8df4dd0fa4c353a2979bd56c34955e9335bb701d"><code>8df4dd0</code></a>
Force cursor to advance in parse_expr calls</li>
<li><a
href="https://github.com/dtolnay/syn/commit/09d020f5a10b3d3e4d54ec03290f773be91b9cac"><code>09d020f</code></a>
Release 2.0.78</li>
<li><a
href="https://github.com/dtolnay/syn/commit/7eaebfbb470fd056ee95ec892fc012ce292e7209"><code>7eaebfb</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/syn/issues/1739">#1739</a>
from dtolnay/chainedcomparison</li>
<li><a
href="https://github.com/dtolnay/syn/commit/b3d2886fc9bbff5eb45995c72beec0463a8cec2a"><code>b3d2886</code></a>
Fix infinite loop on chained comparison</li>
<li><a
href="https://github.com/dtolnay/syn/commit/3f3d0c57ac66b4fa42a3f10209dd1fde29c5ce57"><code>3f3d0c5</code></a>
Add regression test for issue 1738</li>
<li><a
href="https://github.com/dtolnay/syn/commit/346efaec55d7a3865a42fcd1007f45a8a7549052"><code>346efae</code></a>
Touch up PR 1737</li>
<li>Additional commits viewable in <a
href="https://github.com/dtolnay/syn/compare/2.0.77...2.0.79">compare
view</a></li>
</ul>
</details>
<br />


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