Update the Iris color picker to version 1.0.6.

Changes: https://github.com/Automattic/Iris/compare/1.0.4...1.0.6

props mattwiebe.
fixes #30365.
Built from https://develop.svn.wordpress.org/trunk@30551


git-svn-id: http://core.svn.wordpress.org/trunk@30540 1a063a9b-81f0-0310-95a4-ce76da25c4cd