Update dependency eslint-plugin-jsx-a11y to v6.9.0

Author: renovate[bot]

package.json

@@ -53,7 +53,7 @@
     "eslint-config-xo": "0.29.1",
     "eslint-plugin-import": "2.20.2",
     "eslint-plugin-jsdoc": "25.2.0",
-    "eslint-plugin-jsx-a11y": "6.2.3",
+    "eslint-plugin-jsx-a11y": "6.9.0",
     "eslint-plugin-prettier": "3.1.3",
     "husky": "3.1.0",
     "lint-staged": "9.5.0",