Bump eslint-plugin-jsx-a11y from 6.2.3 to 6.3.1

Bumps [eslint-plugin-jsx-a11y](https://github.com/evcohen/eslint-plugin-jsx-a11y) from 6.2.3 to 6.3.1.
- [Release notes](https://github.com/evcohen/eslint-plugin-jsx-a11y/releases)
- [Changelog](https://github.com/jsx-eslint/eslint-plugin-jsx-a11y/blob/master/CHANGELOG.md)
- [Commits](infofarmer/eslint-plugin-jsx-a11y@v6.2.3...v6.3.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -56,7 +56,7 @@
         "enzyme-adapter-react-16": "1.15.2",
         "eslint-plugin-jest": "23.13.2",
         "eslint-plugin-json": "2.1.1",
-        "eslint-plugin-jsx-a11y": "6.2.3",
+        "eslint-plugin-jsx-a11y": "6.3.1",
         "eslint-plugin-react": "7.20.0",
         "nightwatch": "1.3.6",
         "react-test-renderer": "16.13.1",