Bump eslint from 6.5.1 to 7.8.1

Bumps [eslint](https://github.com/eslint/eslint) from 6.5.1 to 7.8.1.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](eslint/eslint@v6.5.1...v7.8.1)

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

package.json

@@ -44,7 +44,7 @@
     "@feathersjs/express": "^4.3.4",
     "@feathersjs/feathers": "^4.3.4",
     "cz-conventional-changelog": "3.0.2",
-    "eslint": "^6.5.1",
+    "eslint": "^7.8.1",
     "feathers-nedb": "^5.0.2",
     "mocha": "^6.2.1",
     "nedb": "^1.8.0",