chore(deps-dev): bump cross-env from 7.0.2 to 7.0.3 in /curriculum

Bumps [cross-env](https://github.com/kentcdodds/cross-env) from 7.0.2 to 7.0.3.
- [Release notes](https://github.com/kentcdodds/cross-env/releases)
- [Changelog](https://github.com/kentcdodds/cross-env/blob/master/CHANGELOG.md)
- [Commits](https://github.com/kentcdodds/cross-env/compare/v7.0.2...v7.0.3)

Signed-off-by: dependabot[bot] <support@github.com>

curriculum/package-lock.json

@@ -3208,9 +3208,9 @@
       }
     },
     "cross-env": {
-      "version": "7.0.2",
-      "resolved": "https://registry.npmjs.org/cross-env/-/cross-env-7.0.2.tgz",
-      "integrity": "sha512-KZP/bMEOJEDCkDQAyRhu3RL2ZO/SUVrxQVI0G3YEQ+OLbRA3c6zgixe8Mq8a/z7+HKlNEjo8oiLUs8iRijY2Rw==",
+      "version": "7.0.3",
+      "resolved": "https://registry.npmjs.org/cross-env/-/cross-env-7.0.3.tgz",
+      "integrity": "sha512-+/HKd6EgcQCJGh2PSjZuUitQBQynKor4wrFbRg4DtAgS1aWO+gU52xpH7M9ScGgXSYmAVS9bIJ8EzuaGw0oNAw==",
       "dev": true,
       "requires": {
         "cross-spawn": "^7.0.1"