chore: remove unused mockprock devDependency

Author: santhosh-apphelix-2u

package-lock.json

@@ -101,7 +101,6 @@
     "which-country": "1.0.0"
   },
   "devDependencies": {
-    "@edx/mockprock": "github:openedx/mockprock#d70b05231bd46b0122616c24e209c890ef2633c0",
     "@edx/stylelint-config-edx": "2.3.3",
     "babel-jest": "29.7.0",
     "jasmine-core": "2.6.4",