build(deps-dev): bump eslint from 6.7.2 to 6.8.0 in /site

Bumps [eslint](https://github.com/eslint/eslint) from 6.7.2 to 6.8.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](https://github.com/eslint/eslint/compare/v6.7.2...v6.8.0)

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

site/package.json

@@ -27,7 +27,7 @@
   },
   "devDependencies": {
     "del": "^5.1.0",
-    "eslint": "^6.7.2",
+    "eslint": "^6.8.0",
     "eslint-config-hexo": "^4.1.0",
     "gulp": "^4.0.2",
     "gulp-cheerio": "^1.0.0",

site/yarn.lock

@@ -1612,10 +1612,10 @@ 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@^6.7.2:
-  version "6.7.2"
-  resolved "https://registry.yarnpkg.com/eslint/-/eslint-6.7.2.tgz#c17707ca4ad7b2d8af986a33feba71e18a9fecd1"
-  integrity sha512-qMlSWJaCSxDFr8fBPvJM9kJwbazrhNcBU3+DszDW1OlEwKBBRWsJc7NJFelvwQpanHCR14cOLD41x8Eqvo3Nng==
+eslint@^6.8.0:
+  version "6.8.0"
+  resolved "https://registry.yarnpkg.com/eslint/-/eslint-6.8.0.tgz#62262d6729739f9275723824302fb227c8c93ffb"
+  integrity sha512-K+Iayyo2LtyYhDSYwz5D5QdWw0hCacNzyq1Y821Xna2xSJj7cijoLLYmLxTQgcgZ9mC61nryMy9S7GRbYpI5Ig==
   dependencies:
     "@babel/code-frame" "^7.0.0"
     ajv "^6.10.0"