Upgrade to grunt-eslint ^9.0.0

Author: cvrebert

.eslintrc

@@ -19,7 +19,10 @@
         "no-array-constructor": 2,
         "no-bitwise": 2,
         "no-constant-condition": 0,
+        "no-dupe-args": 2,
+        "no-duplicate-case": 2,
         "no-eval": 2,
+        "no-extra-strict": 0,
         "no-floating-decimal": 2,
         "no-implied-eval": 2,
         "no-inline-comments": 0,
@@ -31,7 +34,6 @@
         "no-process-env": 2,
         "no-reserved-keys": 0,
         "no-self-compare": 2,
-        "no-space-before-semi": 2,
         "no-spaced-func": 2,
         "no-throw-literal": 2,
         "no-trailing-spaces": 2,
@@ -42,6 +44,7 @@
         "quotes": 0,
         "radix": 2,
         "semi": [2, "always"],
+        "semi-spacing": [2, {"before": false, "after": true}],
         "space-after-keywords": [2, "always", {"checkFunctionKeyword": true}],
         "space-before-blocks": [2, "always"],
         "space-before-function-parentheses": [2, {"anonymous": "always", "named": "never"}],
@@ -50,6 +53,7 @@
         "space-return-throw-case": 2,
         "space-unary-ops": [2, {"words": true, "nonwords": false}],
         "spaced-line-comment": [2, "always"],
+        "strict": [2, "global"],
         "vars-on-top": 0,
         "wrap-iife": [2, "inside"],
         "yoda": [2, "never"]

package.json

@@ -27,7 +27,7 @@
     "grunt-contrib-clean": "^0.6.0",
     "grunt-contrib-jshint": "^0.11.0",
     "grunt-contrib-nodeunit": "^0.4.1",
-    "grunt-eslint": "^7.0.0",
+    "grunt-eslint": "^9.0.0",
     "grunt-jscs": "^1.5.0",
     "load-grunt-tasks": "^3.1.0"
   },