Bump eslint from 3.19.0 to 7.2.0 in /BuildServer

Bumps [eslint](https://github.com/eslint/eslint) from 3.19.0 to 7.2.0.
- [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/v3.19.0...v7.2.0)

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

BuildServer/package.json

@@ -14,7 +14,7 @@
     "body-parser": "^1.15.2",
     "cssnano": "^3.9.1",
     "errorhandler": "^1.5.0",
-    "eslint": "^3.12.2",
+    "eslint": "^7.2.0",
     "express": "4.14.0",
     "fs-extra": "^1.0.0",
     "github": "~9.0.0",