Update cpy-cli to v5

This update necessitates a change to the relative filepath of the
destination folder. The relative path apparently needs to be referenced
twice, as per this open issue:

sindresorhus/cpy-cli#35 (comment)

package.json

@@ -7,7 +7,7 @@
   },
   "devDependencies": {
     "browserify": "^17.0.0",
-    "cpy-cli": "^4.2.0",
+    "cpy-cli": "^5.0.0",
     "del-cli": "^5.0.0",
     "imagemin-cli": "^7.0.0",
     "npm-run-all": "^4.1.5",
@@ -18,7 +18,7 @@
   "scripts": {
     "browserify": "browserify assets/js/main.js > static/main.min.js --debug && browserify assets/js/editor.js > static/editor.min.js --debug",
     "clean": "del ./static/*",
-    "copy": "cpy govuk-frontend/govuk/assets ../static/lib --cwd=node_modules && cpy jquery.min.js ../../../static/lib/ --cwd=node_modules/jquery/dist",
+    "copy": "cpy govuk-frontend/govuk/assets ../../static/lib --cwd=node_modules && cpy jquery.min.js ../../../../../../static/lib/ --cwd=node_modules/jquery/dist",
     "images": "imagemin assets/img/* --out-dir=static/img/",
     "scss": "sass assets/scss/main.scss:static/main.min.css assets/scss/editor.scss:static/editor.min.css --load-path=node_modules --style=compressed",
     "standard": "standard assets/js/main.js",