After upgrading, macro names are persistently displayed in the WYSIWYG editor

Steps to reproduce:

1. Upgrade from XWiki 18.7.0 to 18.9.0. Make sure you use the WYSIWYG editor at least once before upgrading.
2. Open the WYSIWYG editor and insert a macro.

Expected result:

The macro name is only displayed when hovering the macro and styled with a gray background.

Actual result:

Macro names are always displayed, and aren't properly styled:

This is caused by ContentSheet being loaded without version in the URL and thus being cached by the browser (and possibly server-side, haven't checked) at https://github.com/xwiki/xwiki-platform/blob/e91aedf4e3d9e33a52f6a8f20ff449a5a63ce6c1/xwiki-platform-core/xwiki-platform-ckeditor/xwiki-platform-ckeditor-ui/src/main/resources/CKEditor/InlineEditor.xml#L141