Bumped multiple dependencies (some with security issues) to the latest versions.

[bramp]

I don't have an extensive way to test this, but on my own project it seemed to behavior the same.

-    "eslint": "^4.3.0",
-    "eslint-find-rules": "^3.1.1",
-    "eslint-plugin-json": "^1.2.0",
-    "eslint-plugin-mocha": "^4.8.0"
+    "eslint": "^7.19.0",
+    "eslint-find-rules": "^3.6.1",
+    "eslint-plugin-json": "^2.1.2",
+    "eslint-plugin-mocha": "^8.0.0"