fix(jest-snapshot): move @types/prettier to devDependencies

[Kloen]

Move @types/prettier to devDependencies to avoid conflicts with typescript projects using prettier>2.1.5.

Summary

I've been working on a project that uses TypeScript and Prettier directly, while working with it there were a few issues regarding the types (check and format functions).

I'm using [email protected] and [email protected] for testing. After getting some warnings about the types on my IDE, and given that prettier already ships it's own types I decided to check around, turns out that jest-snapshot was listing @types/prettier as a dependency. Not only that, but it's [email protected] so that were giving me erroneous warnings and IDE hints.

I don't see a reason to have @types/prettier as a dependency instead of a devDependency so...

Test plan

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: Kloen / name: Klöen Lansfiel (643ab16)
• ✅ login: SimenB / name: Simen Bekkhus (fe489db)

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[SimenB]

This is correct as the types are not used in the exported types: https://www.runpkg.com/[email protected]/build/index.d.ts

[SimenB]

https://github.com/jestjs/jest/releases/tag/v29.6.2

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