Bump proc-macro2 from 1.0.79 to 1.0.80 (#2368)

Bumps [proc-macro2](https://github.com/dtolnay/proc-macro2) from 1.0.79
to 1.0.80.
<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>1.0.80</h2>
<ul>
<li>Add <code>Literal::byte_character</code> constructor (<a
href="https://redirect.github.com/dtolnay/proc-macro2/issues/449">#449</a>)</li>
<li>Add <code>Literal::c_string</code> constructor <a
href="https://redirect.github.com/dtolnay/proc-macro2/issues/450">#450</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/da51f8d005cc5d8299c1872fad9bbe63b07c31c7"><code>da51f8d</code></a>
Release 1.0.80</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/392fa6c489ffb1f0178dc7377f894cfaf2d4744a"><code>392fa6c</code></a>
Ignore needless_pass_by_value pedantic clippy lint in test</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/1ff5c1f2a91d815dbe531f9570fcf67522b5e27d"><code>1ff5c1f</code></a>
Ignore needless_raw_string_hashes pedantic clippy lint in test</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/0c9449e03d0038f99c0f2dfe6c42878bf531c393"><code>0c9449e</code></a>
Import some Literal tests from libproc_macro</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/28c87ad85264b055b9512c71d1aee4af7353bec4"><code>28c87ad</code></a>
Add tests of negative literal construction</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/c61f5db62c22f727ae59140edb8a4848d962433a"><code>c61f5db</code></a>
Add some tests of cstr raw literals</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/d50dcd9be7136e865020ef58be0244f7a61157e5"><code>d50dcd9</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/proc-macro2/issues/450">#450</a>
from dtolnay/cstr</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/70a804be6d9b21d8707a1c349759f64332429c35"><code>70a804b</code></a>
Add Literal::c_string constructor</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/45730bc1feb07eda221dd5a3e3fe797ce0030c47"><code>45730bc</code></a>
Adjust Literal constructor argument names to match those in
libproc_macro</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/26d1d3f0a4fa112113498fd661d7bb5d51aa057d"><code>26d1d3f</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/proc-macro2/issues/449">#449</a>
from dtolnay/bytechar</li>
<li>Additional commits viewable in <a
href="https://github.com/dtolnay/proc-macro2/compare/1.0.79...1.0.80">compare
view</a></li>
</ul>
</details>
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