Update typescript-eslint monorepo to v2.21.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
@typescript-eslint/eslint-plugin	devDependencies	minor	2.20.0 -> 2.21.0
@typescript-eslint/parser	devDependencies	minor	2.20.0 -> 2.21.0

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Release Notes

typescript-eslint/typescript-eslint

v2.21.0

Compare Source

Bug Fixes

• eslint-plugin: [embt] ignore JSX callbacks (#​1630) (4d45b33)
• eslint-plugin: [no-floating-promises] handle finally callback (#​1620) (1aa7135)
• eslint-plugin: [typedef] allow array/object destructuring in for/of (#​1570) (660bace)
• typescript-estree: process.stdout can be undefined (#​1619) (0d8e87e)

Features

• eslint-plugin: [require-await] add --fix support (#​1561) (9edd863)

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