External Libraries: Update Moment.js to version 2.27.0.

A full list of changes in this update can be found on GitHub: https://github.com/moment/moment/compare/2.26.0...2.27.0

Props hareesh-pillai, desrosj.
Previously [48075].
Fixes #50408.
Built from https://develop.svn.wordpress.org/trunk@48269


git-svn-id: https://core.svn.wordpress.org/trunk@48038 1a063a9b-81f0-0310-95a4-ce76da25c4cd