Update dependency prettier to v2.8.6

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
prettier (source)	2.8.5 -> 2.8.6

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Release Notes

prettier/prettier

### [`v2.8.6`](https://togithub.com/prettier/prettier/blob/HEAD/CHANGELOG.md#​286) [Compare Source](https://togithub.com/prettier/prettier/compare/2.8.5...2.8.6) [diff](https://togithub.com/prettier/prettier/compare/2.8.5...2.8.6) ##### Allow decorators on private members and class expressions ([#​14548](https://togithub.com/prettier/prettier/pull/14548) by [@​fisker](https://togithub.com/fisker)) ```ts // Input class A { @​decorator() #privateMethod () {} } // Prettier 2.8.5 SyntaxError: Decorators are not valid here. (2:3) 1 | class A { > 2 | @​decorator() | ^^^^^^^^^^^^ 3 | #privateMethod () {} 4 | } // Prettier 2.8.6 class A { @​decorator() #privateMethod() {} } ```

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