Replace extract-zip-fork by extract-zip

no issue

- we had to fork the dependency last year, because there was zero support/maintenance

core/server/data/importer/index.js

@@ -7,7 +7,7 @@ var _            = require('lodash'),
     os           = require('os'),
     glob         = require('glob'),
     uuid         = require('uuid'),
-    extract      = require('extract-zip-fork'),
+    extract      = require('extract-zip'),
     errors       = require('../../errors'),
     ImageHandler    = require('./handlers/image'),
     JSONHandler     = require('./handlers/json'),

package.json

@@ -42,7 +42,7 @@
     "downsize": "0.0.8",
     "express": "4.15.0",
     "express-hbs": "1.0.4",
-    "extract-zip-fork": "1.5.1",
+    "extract-zip": "1.6.5",
     "fs-extra": "2.1.2",
     "ghost-gql": "0.0.6",
     "glob": "5.0.15",