Auto merge of #3907 - rust-lang:renovate/prettier-2.x, r=Turbo87

Update dependency prettier to v2.4.0

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [prettier](https://prettier.io) ([source](https://github.com/prettier/prettier)) | [`2.3.2` -> `2.4.0`](https://renovatebot.com/diffs/npm/prettier/2.3.2/2.4.0) | [![age](https://badges.renovateapi.com/packages/npm/prettier/2.4.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/npm/prettier/2.4.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/npm/prettier/2.4.0/compatibility-slim/2.3.2)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/npm/prettier/2.4.0/confidence-slim/2.3.2)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>prettier/prettier</summary>

### [`v2.4.0`](https://github.com/prettier/prettier/blob/master/CHANGELOG.md#&#8203;240)

[Compare Source](https://github.com/prettier/prettier/compare/2.3.2...2.4.0)

[diff](https://github.com/prettier/prettier/compare/2.3.2...2.4.0)

🔗 [Release Notes](https://prettier.io/blog/2021/09/09/2.4.0.html)

</details>

---

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---

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Author: bors

package.json

@@ -119,7 +119,7 @@
     "normalize.css": "8.0.1",
     "nyc": "15.1.0",
     "postcss-nested": "5.0.6",
-    "prettier": "2.3.2",
+    "prettier": "2.4.0",
     "qunit": "2.17.1",
     "qunit-console-grouper": "0.3.0",
     "qunit-dom": "2.0.0",

yarn.lock

@@ -12175,10 +12175,10 @@ prettier-linter-helpers@^1.0.0:
   dependencies:
     fast-diff "^1.1.2"
 
-prettier@2.3.2:
-  version "2.3.2"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.3.2.tgz#ef280a05ec253712e486233db5c6f23441e7342d"
-  integrity sha512-lnJzDfJ66zkMy58OL5/NY5zp70S7Nz6KqcKkXYzn2tMVrNxvbqaBpg7H3qHaLxCJ5lNMsGuM8+ohS7cZrthdLQ==
+prettier@2.4.0:
+  version "2.4.0"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.4.0.tgz#85bdfe0f70c3e777cf13a4ffff39713ca6f64cba"
+  integrity sha512-DsEPLY1dE5HF3BxCRBmD4uYZ+5DCbvatnolqTqcxEgKVZnL2kUfyu7b8pPQ5+hTBkdhU9SLUmK0/pHb07RE4WQ==
 
 [email protected]:
   version "5.6.0"