External Libraries: Update MediaElement.js to version 4.2.17.
This is a minor bug fix release and the latest in the 4.x branch.
A full list of changes can be found on the library’s GitHub: https://github.com/mediaelement/mediaelement/releases/tag/4.2.17.
While this is not the latest version (the 5.x branch is), further testing needs to be done to confirm compatibility in WordPress. #56320 has been opened to explore this.
Props cdbessig, desrosj.
Fixes #56319.
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git-svn-id: http://core.svn.wordpress.org/trunk@53913 1a063a9b-81f0-0310-95a4-ce76da25c4cd
