build(deps): Bump proc-macro2 from 1.0.70 to 1.0.71 (#387)

Bumps [proc-macro2](https://github.com/dtolnay/proc-macro2) from 1.0.70
to 1.0.71.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/dtolnay/proc-macro2/releases">proc-macro2's
releases</a>.</em></p>
<blockquote>
<h2>1.0.71</h2>
<ul>
<li>Turn on <code>deny(unsafe_op_in_unsafe_fn)</code> lint</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/593681be682300bcd7548018d782f5cae9026704"><code>593681b</code></a>
Release 1.0.71</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/6756d1511747d7acddcade86940cb60e1defc3f7"><code>6756d15</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/proc-macro2/issues/427">#427</a>
from dtolnay/unsafeop</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/e95447cf07ae73bc7f21ac0d2b39704f38b0715b"><code>e95447c</code></a>
Fill in unsafe blocks inside unsafe functions</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/54f7f806c42eaaa9f5cf03bd176bd373cdf3fe1d"><code>54f7f80</code></a>
Turn on deny(unsafe_op_in_unsafe_fn)</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/49b26d2d7703f46f4fd1d3baea2c2e3b177a8afb"><code>49b26d2</code></a>
Update ui test suite to nightly-2023-12-15</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/0b963a2921eec9d97bb0ec7bf42c99ae5b113675"><code>0b963a2</code></a>
Unbreak binutils-dev install in GitHub Actions</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/f7576d135f1082f0ae8851aff007b66231472551"><code>f7576d1</code></a>
Format with new rustfmt that handles let-else</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/349dc3fe39fbc9629cdd252431c09857f7789c6e"><code>349dc3f</code></a>
Update afl fuzzer from 0.14 to 0.15</li>
<li>See full diff in <a
href="https://github.com/dtolnay/proc-macro2/compare/1.0.70...1.0.71">compare
view</a></li>
</ul>
</details>
<br />


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