Update eslint requirement from ^7.8.1 to ^7.9.0

Updates the requirements on [eslint](https://github.com/eslint/eslint) to permit the latest version.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](eslint/eslint@v7.8.1...v7.9.0)

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

package.json

@@ -55,7 +55,7 @@
   "devDependencies": {
     "coveralls": "^3.1.0",
     "docdash": "^1.2.0",
-    "eslint": "^7.8.1",
+    "eslint": "^7.9.0",
     "eslint-config-standard": "^14.1.1",
     "eslint-plugin-import": "^2.22.0",
     "eslint-plugin-mocha": "^8.0.0",