[Snyk] Security upgrade eslint from 2.13.1 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:
  • package.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: espree@6.0.0 (Color is RED! freeCodeCamp/freeCodeCamp#11869)
• 5f022bc Fix: no-else-return autofix produces name collisions (fixes Updated GIFs and Screenshots with up-to-date branding of FreeCodeCamp freeCodeCamp/freeCodeCamp#11069) (Add note about arguments object to seek and destroy challenge freeCodeCamp/freeCodeCamp#11867)
• ded9548 Fix: multiline-comment-style incorrect message (Drop it : Test case 2 and 6 expect wrong return value from the function.  freeCodeCamp/freeCodeCamp#11864)
• cad074d Docs: Add JSHint W047 compat to no-floating-decimal (add ugly sweater to shop freeCodeCamp/freeCodeCamp#11861)
• 41f6304 Upgrade: sinon (Revise description for Concatenate Arrays with .concat Challenge freeCodeCamp/freeCodeCamp#11855)
• 167ce87 Chore: remove unuseable profile command (My code is corect and it runes my tests but it won't let me press the button Submit and go to my next challenge freeCodeCamp/freeCodeCamp#11854)
• c844c6f Fix: max-len properly ignore trailing comments (fixes Making text red freeCodeCamp/freeCodeCamp#11838) ("Condense arrays with reduce" example code has bug/typo  freeCodeCamp/freeCodeCamp#11841)
• 1b5661a Fix: no-var should not fix variables named 'let' (fixes browser frozen on fibonacci, lost weeks of work freeCodeCamp/freeCodeCamp#11830) (No tests do not tick, even though all requirements are met  freeCodeCamp/freeCodeCamp#11832)
• 4d75956 Build: CI with Azure Pipelines (Whats the problem here freeCodeCamp/freeCodeCamp#11845)
• 1db3462 Chore: rm superfluous argument & fix perf-multifiles-targets (Challenge [Search and Replace]: Cannot assign to read only property '0' of string 'leaped' freeCodeCamp/freeCodeCamp#11834)
• c57a4a4 Upgrade: @babel/polyfill => core-js v3 (Replaced it with # dead link but it not proceeding issue with the code freeCodeCamp/freeCodeCamp#11833)
• 65faa04 Docs: Clarify prefer-destructuring array/object difference (fixes [beta] Completed challenges don't display proper data on profile page freeCodeCamp/freeCodeCamp#9970) (Add escape as a hotkey to close the map drawer freeCodeCamp/freeCodeCamp#11851)
• 81c3823 Fix: require-atomic-updates reports parameters (fixes add api users/stats, git-stats format records freeCodeCamp/freeCodeCamp#11723) (New  freeCodeCamp/freeCodeCamp#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 Correct code doesn't work freeCodeCamp/freeCodeCamp#11624) (Help! freeCodeCamp/freeCodeCamp#11625)
• 87451f4 Fix: no-octal should report NonOctalDecimalIntegerLiteral (fixes Test cases are a bit misleading freeCodeCamp/freeCodeCamp#11794) (Add note about radio buttons in responsively style radio buttons freeCodeCamp/freeCodeCamp#11805)
• e4ab053 Update: support "bigint" in valid-typeof rule (Fix Test Cases on Card Counting #11794 freeCodeCamp/freeCodeCamp#11802)
• e0fafc8 Chore: removes unnecessary assignment in loop (Hey....I am stuck freeCodeCamp/freeCodeCamp#11780)
• 20908a3 Docs: removed '>' prefix from from docs/working-with-rules (My border-radius % is not working freeCodeCamp/freeCodeCamp#11818)
• 1c43eef Sponsors: Sync README with website

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