Auto merge of #293 - rust-lang:dependabot/cargo/serde_json-1.0.81, r=JohnTitor

Bump serde_json from 1.0.80 to 1.0.81

Bumps [serde_json](https://github.com/serde-rs/json) from 1.0.80 to 1.0.81.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/serde-rs/json/releases">serde_json's releases</a>.</em></p>
<blockquote>
<h2>v1.0.81</h2>
<ul>
<li>Work around <code>indexmap</code>/<code>autocfg</code> not always properly detecting whether a <code>std</code> sysroot crate is available (<a href="https://github-redirect.dependabot.com/serde-rs/json/issues/885">#885</a>, thanks <a href="https://github.com/cuviper"><code>`@​cuviper</code></a>)</li>`
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/serde-rs/json/commit/a0ea9371cd9c163450dbdd978a64d642b0c03873"><code>a0ea937</code></a> Release 1.0.81</li>
<li><a href="https://github.com/serde-rs/json/commit/6c3dfe948a1d088198cfa82f777858502bdb39c2"><code>6c3dfe9</code></a> Make it clearer that preserve_order implies a std dependency</li>
<li><a href="https://github.com/serde-rs/json/commit/f34ef95fd12278fbeae0868dc99f33a608e6ee45"><code>f34ef95</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/serde-rs/json/issues/885">#885</a> from cuviper/indexmap-std</li>
<li><a href="https://github.com/serde-rs/json/commit/27939bb1f99728c8b878778db8ac51b3d98f9c70"><code>27939bb</code></a> Explicitly enable indexmap/std</li>
<li><a href="https://github.com/serde-rs/json/commit/c0f93432cc67d2ac00b081b2f06f4f5e7374955b"><code>c0f9343</code></a> Ignore trait_duplication_in_bounds clippy false positives</li>
<li><a href="https://github.com/serde-rs/json/commit/048a64caec40e5a962f6919354fb7b6a8f0d34fd"><code>048a64c</code></a> Resolve type_repetition_in_bounds clippy lint</li>
<li>See full diff in <a href="https://github.com/serde-rs/json/compare/v1.0.80...v1.0.81">compare view</a></li>
</ul>
</details>
<br />

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Author: bors

Cargo.lock

@@ -20,7 +20,7 @@ anyhow = "1.0.57"
 log = "0.4"
 semver = "1.0" # Keep in sync with version pulled by Cargo
 serde = { version = "1.0.137", features = ["derive"] }
-serde_json = "1.0.80"
+serde_json = "1.0.81"
 quote = "1.0.10"
 proc-macro2 = "1.0.32"