Bump serde from 1.0.171 to 1.0.180#99

Bumps [serde](https://github.com/serde-rs/serde) from 1.0.171 to 1.0.180. <details> <summary>Release notes</summary> <p><em>Sourced from <a href="https://github.com/serde-rs/serde/releases">serde's releases</a>.</em></p> <blockquote> <h2>v1.0.180</h2> <ul> <li>Update to 2018 edition</li> </ul> <h2>v1.0.179</h2> <ul> <li>Support serialization of tuple variants inside a flattened field (<a href="https://redirect.github.com/serde-rs/serde/issues/2448">#2448</a>, thanks <a href="https://github.com/Mingun"><code>@​Mingun</code></a>)</li> </ul> <h2>v1.0.178</h2> <ul> <li>Fix build error when using serde with &quot;std&quot; feature turned off and &quot;unstable&quot; feature turned on (<a href="https://redirect.github.com/serde-rs/serde/issues/2541">#2541</a>)</li> </ul> <h2>v1.0.177</h2> <ul> <li>Add <code>serde(rename_all_fields = &quot;...&quot;)</code> attribute to apply a <code>rename_all</code> on every struct variant of an enum (<a href="https://redirect.github.com/serde-rs/serde/issues/1695">#1695</a>, thanks <a href="https://github.com/jplatte"><code>@​jplatte</code></a>)</li> <li>Improve diagnostics for attribute parse errors (<a href="https://redirect.github.com/serde-rs/serde/issues/2536">#2536</a>, thanks <a href="https://github.com/jplatte"><code>@​jplatte</code></a>)</li> </ul> <h2>v1.0.176</h2> <ul> <li>Allow tag field of an internally tagged enum to have same name as a field inside a skipped struct variant (<a href="https://redirect.github.com/serde-rs/serde/issues/2266">#2266</a>, thanks <a href="https://github.com/flisky"><code>@​flisky</code></a>)</li> </ul> <h2>v1.0.175</h2> <ul> <li>Restore missing LICENSE files in serde_derive crate (<a href="https://redirect.github.com/serde-rs/serde/issues/2527">#2527</a>, thanks <a href="https://github.com/ankane"><code>@​ankane</code></a>)</li> </ul> <h2>v1.0.174</h2> <ul> <li>Documentation improvements</li> </ul> <h2>v1.0.173</h2> <ul> <li>Fix missing trait implementations when using serde derive macro on a macro-generated data structure, such as via the <code>bitflags</code> crate (<a href="https://redirect.github.com/serde-rs/serde/issues/2516">#2516</a>)</li> </ul> <h2>v1.0.172</h2> <ul> <li>Experiment with precompiling the serde_derive macros to reduce build time (<a href="https://redirect.github.com/serde-rs/serde/issues/2514">#2514</a>)</li> </ul> </blockquote> </details> <details> <summary>Commits</summary> <ul> <li><a href="https://github.com/serde-rs/serde/commit/033d05f70b539226818403422295e16cf15bb3c4"><code>033d05f</code></a> Release 1.0.180</li> <li><a href="https://github.com/serde-rs/serde/commit/fe4e3fd3b0d59e8e2bfed071b234dbae5fd779c1"><code>fe4e3fd</code></a> Merge pull request <a href="https://redirect.github.com/serde-rs/serde/issues/2547">#2547</a> from dtolnay/tombstone</li> <li><a href="https://github.com/serde-rs/serde/commit/8a8a8a70ee8f32339623d77d44af53a39951ddd9"><code>8a8a8a7</code></a> Delete tombstones of the __private module</li> <li><a href="https://github.com/serde-rs/serde/commit/339dca828dcece3a8e2d928a65ceceb5664efc6a"><code>339dca8</code></a> Merge pull request <a href="https://redirect.github.com/serde-rs/serde/issues/2546">#2546</a> from dtolnay/edition</li> <li><a href="https://github.com/serde-rs/serde/commit/0d7349fa4e1f5edf55da03a284c856056f335b60"><code>0d7349f</code></a> Resolve ambiguous core import on rustc 1.64 through 1.71</li> <li><a href="https://github.com/serde-rs/serde/commit/830528d5b109fc1e8a0c4cbe720d88e881b12088"><code>830528d</code></a> Update to 2018 edition</li> <li><a href="https://github.com/serde-rs/serde/commit/ab90fbc7c982234788f64fc3d89c5d59c58ab767"><code>ab90fbc</code></a> Apply 'cargo fix --edition'</li> <li><a href="https://github.com/serde-rs/serde/commit/3eec111e8f8c1a17db55d55f3aeb52a6a9be53de"><code>3eec111</code></a> Delete support for compilers without crate::-based module system</li> <li><a href="https://github.com/serde-rs/serde/commit/93884336421a07c9d7f32881ee8f78228d31b066"><code>9388433</code></a> Rename 'try!' macro to 'tri!' in preparation for 2018 edition</li> <li><a href="https://github.com/serde-rs/serde/commit/ba120706652cd71684e04cb1e1d9589c964d248d"><code>ba12070</code></a> Merge pull request <a href="https://redirect.github.com/serde-rs/serde/issues/2545">#2545</a> from dtolnay/up</li> <li>Additional commits viewable in <a href="https://github.com/serde-rs/serde/compare/v1.0.171...v1.0.180">compare view</a></li> </ul> </details> <br /> [](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores) Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. 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