chore(deps): update dependency prettier to v2.8.6 (#4382)

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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)) | [`2.8.5` ->
`2.8.6`](https://renovatebot.com/diffs/npm/prettier/2.8.5/2.8.6) |
[![age](https://badges.renovateapi.com/packages/npm/prettier/2.8.6/age-slim)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://badges.renovateapi.com/packages/npm/prettier/2.8.6/adoption-slim)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://badges.renovateapi.com/packages/npm/prettier/2.8.6/compatibility-slim/2.8.5)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://badges.renovateapi.com/packages/npm/prettier/2.8.6/confidence-slim/2.8.5)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

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

###
[`v2.8.6`](https://github.com/prettier/prettier/blob/HEAD/CHANGELOG.md#&#8203;286)

[Compare
Source](https://github.com/prettier/prettier/compare/2.8.5...2.8.6)

[diff](https://github.com/prettier/prettier/compare/2.8.5...2.8.6)

##### Allow decorators on private members and class expressions
([#&#8203;14548](https://github.com/prettier/prettier/pull/14548) by
[@&#8203;fisker](https://github.com/fisker))

<!-- prettier-ignore -->

```ts
// Input
class A {
  @&#8203;decorator()
  #privateMethod () {}
}

// Prettier 2.8.5
SyntaxError: Decorators are not valid here. (2:3)
  1 | class A {
> 2 |   @&#8203;decorator()
    |   ^^^^^^^^^^^^
  3 |   #privateMethod () {}
  4 | }

// Prettier 2.8.6
class A {
  @&#8203;decorator()
  #privateMethod() {}
}
```

</details>

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yarn.lock

@@ -17656,11 +17656,11 @@ __metadata:
   linkType: hard
 
 "prettier@npm:^2.8.4":
-  version: 2.8.5
-  resolution: "prettier@npm:2.8.5"
+  version: 2.8.6
+  resolution: "prettier@npm:2.8.6"
   bin:
     prettier: bin-prettier.js
-  checksum: b7f8d30e14061e0478bc5a59d4d889688d804c173a0daa91b1b85dc08eef5eb6956d1b59f4037770776fda5b967f6c9ca3b7a8a43c50bedb4c7b182029f865aa
+  checksum: 8ac94fa67aec0e65743ea15ebf954ef2f1e52638abd129dc04e8b49e8bb3224c0233c98df6b5c98efd31bd2a43866590486559438ee4ead09dc81be389068572
   languageName: node
   linkType: hard