update shrinkwrap to get clean-css v2.2.3

Refs #13914
Refs https://github.com/GoalSmashers/clean-css/issues/302
Revert "Turn off clean-css' advanced optimizations."

This reverts commit 25ca51319b016bc4e42e1ba882d6f191e001d65d.
grunt dist; closes #13914
Revert "Revert "Turn off clean-css' advanced optimizations.""

This reverts commit e31c2edf885efd42d2e755f189cc15125d977d70.
Run `grunt`.

Revert a991cd572c8b3cafa6228915ca86f7a0cdd26e2d.