Embeds: Remove Hulu from the list of supported oEmbed providers.

The oEmbed service for Hulu no longer works and appears to have been silently disabled.

Props tacitonic, talldanwp, youknowriad, bph.
Fixes #50676.
Built from https://develop.svn.wordpress.org/trunk@48512


git-svn-id: https://core.svn.wordpress.org/trunk@48274 1a063a9b-81f0-0310-95a4-ce76da25c4cd