[Snyk] Security upgrade eslint from 4.19.1 to 6.0.0

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • snap-reference/package.json
  • snap-reference/package-lock.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Issue	Breaking Change	Exploit Maturity
	Regular Expression Denial of Service (ReDoS) SNYK-JS-ACORN-559469	Yes	No Known Exploit

Commit messages

Package name: eslint

The new version differs by 250 commits.

• a7985a6 6.0.0
• be74dd9 Build: changelog update for 6.0.0
• 81aa06b Upgrade: [email protected] (#11869)
• 5f022bc Fix: no-else-return autofix produces name collisions (fixes #11069) (#11867)
• ded9548 Fix: multiline-comment-style incorrect message (#11864)
• cad074d Docs: Add JSHint W047 compat to no-floating-decimal (#11861)
• 41f6304 Upgrade: sinon (#11855)
• 167ce87 Chore: remove unuseable profile command (#11854)
• c844c6f Fix: max-len properly ignore trailing comments (fixes #11838) (#11841)
• 1b5661a Fix: no-var should not fix variables named 'let' (fixes #11830) (#11832)
• 4d75956 Build: CI with Azure Pipelines (#11845)
• 1db3462 Chore: rm superfluous argument & fix perf-multifiles-targets (#11834)
• c57a4a4 Upgrade: @babel/polyfill => core-js v3 (#11833)
• 65faa04 Docs: Clarify prefer-destructuring array/object difference (fixes #9970) (#11851)
• 81c3823 Fix: require-atomic-updates reports parameters (fixes #11723) (#11774)
• aef8ea1 Sponsors: Sync README with website
• 4f48f5a 6.0.0-rc.0
• 6bad650 Build: changelog update for 6.0.0-rc.0
• f403b07 Update: introduce minKeys option to sort-keys rule (fixes #11624) (#11625)
• 87451f4 Fix: no-octal should report NonOctalDecimalIntegerLiteral (fixes #11794) (#11805)
• e4ab053 Update: support "bigint" in valid-typeof rule (#11802)
• e0fafc8 Chore: removes unnecessary assignment in loop (#11780)
• 20908a3 Docs: removed '>' prefix from from docs/working-with-rules (#11818)
• 1c43eef Sponsors: Sync README with website

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