Infrastructure: Bump eslint from 7.18.0 to 7.20.0 (pull #1762)

Bumps [eslint](https://github.com/eslint/eslint) from 7.18.0 to 7.20.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](eslint/eslint@v7.18.0...v7.20.0)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -36,7 +36,7 @@
     "ava": "^3.15.0",
     "cheerio": "^1.0.0-rc.5",
     "cspell": "^5.2.4",
-    "eslint": "^7.18.0",
+    "eslint": "^7.20.0",
     "eslint-config-prettier": "^7.2.0",
     "babel-eslint": "^10.1.0",
     "eslint-plugin-ava": "^11.0.0",