fix: upgrade ng-sortable from 1.3.7 to 1.3.8

Snyk has created this PR to upgrade ng-sortable from 1.3.7 to 1.3.8.

See this package in npm:
https://www.npmjs.com/package/ng-sortable

See this project in Snyk:
https://app.snyk.io/org/cgx/project/eadf6b62-aeba-42c4-ad77-707f5a77c92d?utm_source=github&utm_medium=referral&page=upgrade-pr