chore(deps): update dependency eslint to v6.2.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
eslint (source)	devDependencies	patch	6.2.0 -> 6.2.1

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Release Notes

eslint/eslint

v6.2.1

Compare Source

• 8c021b5 Upgrade: eslint-utils 1.4.2 (#​12131) (Toru Nagashima)
• e82388b Sponsors: Sync README with website (ESLint Jenkins)
• 4aeeeed Docs: update docs for ecmaVersion 2020 (#​12120) (silverwind)
• 6886148 Docs: Add duplicate keys limitation to accessor-pairs (#​12124) (Milos Djermanovic)

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