fix: upgrade eslint-plugin-jsx-a11y from 6.4.1 to 6.8.0 (#277)

Snyk has created this PR to upgrade eslint-plugin-jsx-a11y from 6.4.1 to 6.8.0.

See this package in npm:
https://www.npmjs.com/package/eslint-plugin-jsx-a11y

See this project in Snyk:
https://app.snyk.io/org/loonz206/project/e170a75b-6111-4781-ada4-5defdee12061?utm_source=github&utm_medium=referral&page=upgrade-pr

Co-authored-by: snyk-bot <snyk-bot@snyk.io>