Bump log from 0.4.18 to 0.4.19 in /cmd/pinniped-proxy (#6305)

Bumps [log](https://github.com/rust-lang/log) from 0.4.18 to 0.4.19.
<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>[0.4.19] - 2023-06-10</h2>
<ul>
<li>Use target_has_atomic instead of the old atomic_cas cfg by <a
href="https://github.com/GuillaumeGomez"><code>@​GuillaumeGomez</code></a>
in <a
href="https://redirect.github.com/rust-lang/log/pull/555">rust-lang/log#555</a></li>
<li>Put MSRV into Cargo.toml by <a
href="https://github.com/est31"><code>@​est31</code></a> in <a
href="https://redirect.github.com/rust-lang/log/pull/557">rust-lang/log#557</a></li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/rust-lang/log/commit/84ddc30ecc54e464b791dd591a5becc02f4fd06c"><code>84ddc30</code></a>
Merge pull request <a
href="https://redirect.github.com/rust-lang/log/issues/552">#552</a>
from rust-lang/cargo/0.4.18</li>
<li><a
href="https://github.com/rust-lang/log/commit/9ae986d8e5fcb5980e436b838672de94d2d5bec7"><code>9ae986d</code></a>
Merge pull request <a
href="https://redirect.github.com/rust-lang/log/issues/548">#548</a>
from iorust/master</li>
<li><a
href="https://github.com/rust-lang/log/commit/5322e569d0549c6c23a1dc179122b5797fba1b0a"><code>5322e56</code></a>
update changelog to reflect actual changes</li>
<li><a
href="https://github.com/rust-lang/log/commit/db9e5cc2140cfb5ab0a39c84769ccd887323a49a"><code>db9e5cc</code></a>
Add the structured-logger crate to the README</li>
<li><a
href="https://github.com/rust-lang/log/commit/92e83c04f3dfc99c71c63e6f144878517f0fd563"><code>92e83c0</code></a>
fixes for unrevert</li>
<li><a
href="https://github.com/rust-lang/log/commit/54d48fb53e6ba9cb059968c48dc9580bee4fc003"><code>54d48fb</code></a>
prepare for 0.4.19 release</li>
<li><a
href="https://github.com/rust-lang/log/commit/3c8473d9ed17f12db4487062f64eab705ea803b3"><code>3c8473d</code></a>
Revert &quot;Revert &quot;Remove build.rs file&quot;&quot;</li>
<li>See full diff in <a
href="https://github.com/rust-lang/log/compare/0.4.18...0.4.19">compare
view</a></li>
</ul>
</details>
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