Bump log from 0.4.19 to 0.4.20 (#62)

Bumps [log](https://github.com/rust-lang/log) from 0.4.19 to 0.4.20.
<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>[0.4.20] - 2023-07-11</h2>
<ul>
<li>Remove rustversion dev-dependency by <a
href="https://github.com/Thomasdezeeuw"><code>@​Thomasdezeeuw</code></a>
in <a
href="https://redirect.github.com/rust-lang/log/pull/568">rust-lang/log#568</a></li>
<li>Remove <code>local_inner_macros</code> usage by <a
href="https://github.com/EFanZh"><code>@​EFanZh</code></a> in <a
href="https://redirect.github.com/rust-lang/log/pull/570">rust-lang/log#570</a></li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/rust-lang/log/commit/4708f1484c7e6b8d4418b571c05e613b18e57673"><code>4708f14</code></a>
Merge pull request <a
href="https://redirect.github.com/rust-lang/log/issues/574">#574</a>
from chrysn-pull-requests/doc-log-to-defmt</li>
<li><a
href="https://github.com/rust-lang/log/commit/6de3cccc3670231edae0b2c86202a002aae65b2d"><code>6de3ccc</code></a>
Merge pull request <a
href="https://redirect.github.com/rust-lang/log/issues/571">#571</a>
from rust-lang/cargo/0.4.20</li>
<li><a
href="https://github.com/rust-lang/log/commit/838920cf182cf7d24ff411834c85a46d92ed0463"><code>838920c</code></a>
Merge pull request <a
href="https://redirect.github.com/rust-lang/log/issues/575">#575</a>
from EFanZh/group-target-module-path-and-file</li>
<li><a
href="https://github.com/rust-lang/log/commit/3985711f74bb75a6504c41f6f4b66ad5fd29ef41"><code>3985711</code></a>
Group <code>target</code>, <code>module_path</code> and
<code>file</code> arguments</li>
<li><a
href="https://github.com/rust-lang/log/commit/3f534d00e485ba7f029b9ef348385154e4e51dfd"><code>3f534d0</code></a>
Move private APIs into a single module</li>
<li><a
href="https://github.com/rust-lang/log/commit/f5ab686e9b1ce6962dd4e02d6cc71a1d7ec48ea6"><code>f5ab686</code></a>
doc: Add log-to-defmt to other-facilities section</li>
<li><a
href="https://github.com/rust-lang/log/commit/6d173bf94114f62217349b76bc18ed4340f12586"><code>6d173bf</code></a>
prepare for 0.4.20 release</li>
<li><a
href="https://github.com/rust-lang/log/commit/cab10885defdf445dc730e5a22f67fcec69ca728"><code>cab1088</code></a>
Merge pull request <a
href="https://redirect.github.com/rust-lang/log/issues/570">#570</a>
from EFanZh/remove-local-inner-macros</li>
<li><a
href="https://github.com/rust-lang/log/commit/9d052b17d3ddf9b5894740c6d82899c531c789ee"><code>9d052b1</code></a>
Remove <code>local_inner_macros</code> usage</li>
<li><a
href="https://github.com/rust-lang/log/commit/e9123d6d9a62a99771bd33e43a29f67f7811eee0"><code>e9123d6</code></a>
Merge pull request <a
href="https://redirect.github.com/rust-lang/log/issues/568">#568</a>
from Thomasdezeeuw/remove-rustversion-dep</li>
<li>Additional commits viewable in <a
href="https://github.com/rust-lang/log/compare/0.4.19...0.4.20">compare
view</a></li>
</ul>
</details>
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