Bump prettier from 2.6.2 to 2.8.7 in /desktop

Summary: Updates prettier and applies the fixes.

Reviewed By: antonk52

Differential Revision: D45087515

fbshipit-source-id: 226814ab4805eb12e64c2134407164498c708c0a

desktop/flipper-plugin/src/ui/theme.tsx

@@ -70,7 +70,7 @@ export const theme = {
 } as const;
 
 export type Spacing =
-  | keyof typeof theme['space']
+  | keyof (typeof theme)['space']
   | number
   | undefined
   | boolean;