Update video.js to latest 4.x version

Steps to reproduce

Steps to reproduce:
1. Currently video.js is version 4.7. There is already a version 4.9 out and a version 5.0. As 5.0 does not work without some refactoring of the theodul plugin code, but 4.9 does it makes sence to update the player to the last 4.x release.

Fixed and reviewed
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Rüdiger Rolf


Rüdiger Rolf