Bump eslint from 6.3.0 to 6.4.0 in /npm_and_yarn/helpers

Bumps [eslint](https://github.com/eslint/eslint) from 6.3.0 to 6.4.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](eslint/eslint@v6.3.0...v6.4.0)

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

npm_and_yarn/helpers/package.json

@@ -15,7 +15,7 @@
     "semver": "^6.3.0"
   },
   "devDependencies": {
-    "eslint": "^6.3.0",
+    "eslint": "^6.4.0",
     "eslint-plugin-prettier": "^3.1.0",
     "jest": "^24.9.0",
     "nock": "^10.0.6",

npm_and_yarn/helpers/yarn.lock

@@ -1690,10 +1690,10 @@ eslint-visitor-keys@^1.0.0, eslint-visitor-keys@^1.1.0:
   resolved "https://registry.yarnpkg.com/eslint-visitor-keys/-/eslint-visitor-keys-1.1.0.tgz#e2a82cea84ff246ad6fb57f9bde5b46621459ec2"
   integrity sha512-8y9YjtM1JBJU/A9Kc+SbaOV4y29sSWckBwMHa+FGtVj5gN/sbnKDf6xJUl+8g7FAij9LVaP8C24DUiH/f/2Z9A==
 
-eslint@^6.3.0:
-  version "6.3.0"
-  resolved "https://registry.yarnpkg.com/eslint/-/eslint-6.3.0.tgz#1f1a902f67bfd4c354e7288b81e40654d927eb6a"
-  integrity sha512-ZvZTKaqDue+N8Y9g0kp6UPZtS4FSY3qARxBs7p4f0H0iof381XHduqVerFWtK8DPtKmemqbqCFENWSQgPR/Gow==
+eslint@^6.4.0:
+  version "6.4.0"
+  resolved "https://registry.yarnpkg.com/eslint/-/eslint-6.4.0.tgz#5aa9227c3fbe921982b2eda94ba0d7fae858611a"
+  integrity sha512-WTVEzK3lSFoXUovDHEbkJqCVPEPwbhCq4trDktNI6ygs7aO41d4cDT0JFAT5MivzZeVLWlg7vHL+bgrQv/t3vA==
   dependencies:
     "@babel/code-frame" "^7.0.0"
     ajv "^6.10.0"