Auto merge of #277 - rust-lang:dependabot/cargo/log-0.4.16, r=JohnTitor

Bump log from 0.4.14 to 0.4.16

Bumps [log](https://github.com/rust-lang/log) from 0.4.14 to 0.4.16.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/rust-lang/log/blob/master/CHANGELOG.md">log's changelog</a>.</em></p>
<blockquote>
<h2>[0.4.16] - 2022-03-22</h2>
<ul>
<li>Fix a conflict with unqualified <code>Option</code> use in macros.</li>
</ul>
<h2>[0.4.15] - 2022-02-23</h2>
<ul>
<li>Silence a warning about the deprecated <code>spin_loop_hint</code>.</li>
<li>Relax ordering in the atomic <code>set_max_level</code> call.</li>
<li>Add thumbv4t-none-eabi to targets that don't support atomics</li>
<li>Allow levels to be iterated over.</li>
<li>Implement <code>Log</code> on some common wrapper types.</li>
<li>Improvements to test coverage.</li>
<li>Improvements to documentation.</li>
<li>Add key-value support to the <code>log!</code> macros.</li>
<li>Tighten <code>kv_unstable</code> internal dependencies so they don't bump past their current alpha.</li>
<li>Add a simple visit API to <code>kv_unstable</code>.</li>
<li>Support <code>NonZero*</code> integers as values in structured logging</li>
<li>Support static strings as keys in structured logging</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li>See full diff in <a href="https://github.com/rust-lang/log/commits">compare view</a></li>
</ul>
</details>
<br />

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[//]: # (dependabot-automerge-start)
[//]: # (dependabot-automerge-end)

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</details>

Author: bors